Sometimes it is necessary to consult the list of "option codes" on your Fiero to determine which specific parts it contained as-built by the factory. For example, it is difficult to know the capacity of an alternator by looking at it. The list of option codes (also called RPO or Regular Production Option codes) provides this information. The option codes are printed on a sticker called the "Service Parts Identification Label" located on the left front fender well next to the spare tire. (This label is often referred to as the "RPO Tag" or "RPO Label".) Here is what the codes mean:

AAA	Additional Standard Equipment
AD3	Window, hinged roof (sunroof)
AF9	Seat, front, bucket, driver, passenger, reclining ('84-87)
AF9	Lumbar seat, adjustable, driver, passenger ('88)
AR9	Seat, front bucket, driver, passenger, manual reclining
AU3	Power door locks
AV3	Fastener, cargo tie down
A01	Window, deep tinted all, Soft Ray
A31	Window, electric control
A90	Deck lid release, remote control, electric
BC8	Front door pocket RH and LH (available only w/A31)
BW1	Ornamentation, extra, rear BW8 Ornamentation, extra, rear
BX1	Ornamentation, exterior, front end (special)
BY1	Ornamentation, extra, rear
B20	Interior, luxury (w/trim codes 662,822)
B34	Floor mats, front, carpeted
B48	Deluxe trunk trim
B57	Trim, extra, Deluxe
B6V	Delete AU3 (in package order) (1987)
B6W	Delete A31 (in package order) (1987)
B97	Molding, extra lower accent
CD4	Wiper system, pulse
CJB	T-Tops ('88 only)
C41	Heater, with fan and defroster ('84-87)
C41	Heater, base (non AC) ('88)
C49	Defogger, rear window, electric
C60	Air conditioner, front, manual controls
DB4	Sunshade, windshield, with pockets
DC9	Sensor, vehicle speed
DG7	Mirror, RH and LH remote control, electric
D4P	VSS Gear, 30 tooth, blue
D4T	Gear, Speedometer Driven 
D4Q	Gear, Speedometer Driven (31 teeth)
D7V	Gear, Speedometer Driven
D9C	Sensor, Vehicle Speed (35 teeth) (25007335)
D9D	Sensor, Vehicle Speed
D34	Mirror, visor vanity
D35	Mirror, outside, rearview (painted)
D42	Engine Compartment Screen ('84)
D60	Color and trim incompatibly override ('84-87)
D74	Mirror, inside, RH visor vanity, illuminated
D80	Extension, rear end panel (spoiler)
D96	Stripe, body side upper
E5Z	Speedometer Gears Less Adapter
E9Y	Vehicle Speed Sensor
E9Z	Speedo Gears Less Keys
E94	Beauville/Rally STX equipment
FW5	Transaxle, final drive, 4.10 ratio
FX8	Transaxle, final drive, 3.61 ratio
F41	Suspension, heavy duty, front and rear (special)
GX3	Transaxle, final drive, 3.33 ratio
GY5	Transaxle, final drive, 3.65 ratio
KO5	Heater, engine block
K22	Generator, 94 ampere
K34	Cruise control, electric
K60	Generator, 100 ampere
K81	Generator, 66 ampere
K99	Generator, 85 ampere
LR8	Engine, 2.5L L4
L44	Engine, 2.8L V6 (High Output)
MD9	3-speed automatic transmission (THM125C)
MG2	Transmission, manual, 5-speed (Muncie) 3.61 ratio
MG3	Transmission, manual, 5-speed (Muncie)
MM4	Transmission, manual, 4-speed, provisions
MM5	Transmission, manual, 5-speed, provisions
MT2	5-speed manual transmission (Isuzu) 3.35 ratio
MV9	3 speed automatic transmission (THM200C)
MX1	3 speed automatic transmission
MY7	4-speed manual transmission (Isuzu)
MY8	4-speed manual transmission (Muncie) 3.32 ratio
M17	4-speed manual transmission (Muncie) 3.65 ratio
M19	4-speed manual transmission (Muncie) 4.10 ratio
NA5	Emission system, federal requirements
NB2	Emission system, Calif. requirements
NK3	Steering wheel, Formula, 3-spoke ('84-85)
NK4	Steering wheel, leather wrapped, 4-spoke ('86-87)
NN7	Fuel filler door, delete lock
NP5	Steering wheel, leather wrapped, 3-spoke
NX1	Wheel, 13 x 5.5
N24	Wheels, turbo finned, aluminum (same as PX1) ('84-85)
N33	Steering column, tilt type
N36	Steering wheel, sport
N41	Power Steering (power steering was eliminated from all production Fieros)
N46	Steering wheel, four-spoke, vinyl
N73	Wheel, Custom Sport, Variation 4
N78	Wheel, 14x7 cast aluminum
N90	Wheel, 15x7 cast aluminum
PB4	Lock kit, aluminum wheel
PHO	Wheel, 15x6 front, 15x7 rear, diamond honeycomb
PON	Pontiac Assembly Plant
PXT	Wheels, 13 inch turbo-finned, aluminum
PX1	Wheels, 13 x 5.5 turbo finned aluminum (same as N24)
PO2	Wheel covers, tri-tech 13 inch (color Coordinated)
PO6	Wheel trim rings
QAB	P195/70R14 blackwall, steel-belted (1988)
QDX	P195/70R14 blackwall, steel-belted ('85-87)
QDY	P195/70R14 white-lettered, steel-belted ('85-87)
QFE	P185/75R14 blackwall, steel-belted ('86-88)
QFG	P185/75R14 white-lettered, steel-belted ('86-87)
QHS	P185/80R13 blackwall, steel-belted ('84-85)
QHU	P185/80R13 white-lettered, steel-belted ('84-85)
QPU	P215/60R14 blackwall, steel-belted ('84-87)
QPV	P215/60R14 white-lettered, steel-belted ('84-85)
QPV	P215/60R15 blackwall, steel-belted (front); P215/60R15 blackwall, steel-belted (rear) ('86-87)
QRF	P185/70R14 blackwall QZN P185/80R13 blackwall
QZT	P205/60R15 blackwall, steel-belted (front); P215/60R15 blackwall, steel-belted (rear)
TR9	Lamp group, courtesy consists of:
	U25 Rear compartment lamp
	U29 Instrument panel, courtesy
UA1	Heavy duty battery
UL1	ETR AM/FM stereo w/clock
UL5	Radio delete (all)
UL6	AM w/clock (1984)
UM4	ETR AM/FM stereo w/seek & scan, auto reverse, clock
UM6	ETR AM/FM stereo w/clock, cassette, auto rev cassette, seek & scan ('85-88)
UM7	ETR AM/FM stereo w/clock, seek & scan ('86-87)
UQ6	Speaker, sub woofer ('86-88)
UT4	ETR AM stereo/FM stereo w/clock, auto reverse, seek & scan, equalizer & touch control ('85-87)
UU6	ETR AM/FM stereo w/clock, cassette, equalizer, seek & scan
UU7	ETR AM/FM stereo w/clock, cassette (1984)
UU9	ETR AM/FM stereo (1984)
UW5	Radio, provisions for stereo installation
UX1	ETR AM/FM stereo w/clock, cassette, auto rev, search, replay, seek & scan, equalizer, clock ('85-88)
U25	Rear compartment lamp
U29	Instrument panel, courtesy
U63	AM monaural radio, without clock
U66	Speaker system, 4, dual front dash Mounted, dual extended range, package shelf/quarter
VC8	Substitution or deletion authorized ('84-87)
VK3	License plate, front mounting package
VO8	Heavy duty cooling
V53	Luggage Carrier, delete (1984)
V56	Luggage carrier, deck lid
V58	Luggage carrier, deck lid
V73	Bumper Component (or see next item)
V73	Vehicle Identification US WS1 Option picks (group) ('85-87)
WS3	Option picks (group) (1986)
WS6	Performance package, special
WS8	Priced order acknowledged
WS9	High mileage coupe ('84)
WU2	Fiero GT
WV1	Protective equipment, Canada [probably undercoating]
WV9	Package, value leader, ('84-86)
WV9	Package, value leader, ('87) (PM37 + WV9 = PE37)
WV9	Package, value leader, ('88) (2PM37 + WV9 = WPE37)
WO2	Sport appearance package ('88)
W61	Option group #1 (1987)
W63	Option group #2 (1987)
W66	Formula option ('88)
W69	SE option "Special Edition" XEM Tires, Goodyear Eagle GT+4 P205/60R15 BSW STL (front)
YT1	Built-up, custom door and quarter
YT9	Fisher furnished parts 
Y82	Indy Pace Car ltd. edition (Includes AD3, B34, DG7, D80, NP5, UU6 & V53) (1984)
Y99	Special Rally suspension package (special shocks, 14" Hi-Tech wheels, P195/70R14 SB Tires, 1985-86)
YLM	P215/60 R15 BSW STL (front) W/P215/60 R15 BSW STL (rear)
YLM	P205/60R15 BSW STL w/P215/60R15 BSW STL (front and rear)
YT9	Fisher Furnished Parts
Z35	Advance price sheet
ZV1	Manufacturer's statement of origin
1SA	Option group #1 (1988)
1SB	Option group #2 (1988)
1SC	Option group #3 (1988)
13B	Genor cloth ('84) Pallex cloth ('85) Light Slate Gray
13C	Placid/Pallex cloth, Light Slate Gray ('84-85) (2 tone)
13D	Indy 500/Sierra leather/Pallex cloth, Light Slate Gray
13I	Interior Color, Light Slate Gray
14	Light Gray Metallic ('84-85)
14U	Light Gray Metallic (upper of two tone)
16	Silver Metallic ('86-88)
18	Medium Gray Metallic
18L	Medium Gray Metallic (lower of two tone)
19P	Wheel Color, Black
21	Bright Blue Metallic
40	White ('84-86, 88)
40U	White (upper of two tone)
41	Black
41L	Black accent
41U	Black (upper of two tone)
53	Bright Yellow (1988)
56	Light Gold Metallic ('86-87)
60P	15" diamond spoke wheels, gold ('88 GT)
62B	Ripple cloth, Light Saddle
62D	Pallex cloth, Light Saddle
62I	Interior Trim, Light Saddle
622	Suede leather/Pallex cloth, Light Saddle
64B	Genor cloth ('84), Pallex cloth ('85) Medium Doeskin
64C	Placid/Pallex cloth, Medium Doeskin (2 tone)
64D	Pallex cloth, Medium Doeskin (2 tone)
643	Fleece/Suede, Medium Doeskin (2 tone)
66B	Pallex cloth, Medium Beechwood
66D	Matrix cloth, Medium Beechwood
64I	Interior Color, Medium Doeskin
649	Seat Belt Module, Medium Doeskin
71	Red
71L	Paint, Red (Lower Accent)
71U	Paint, Red (upper of two tone)
77	Ruby Red ('87-88)
81	Bright Red
81U	Bright Red (upper of two tone)
82B	Ripple cloth, Dark Gray
82D	Pallex cloth, Dark Gray D (trim level) Deluxe
82I	Interior Color, Medium Dark Gray
139	Seat Belt Module, Light Slate Gray
629	Seatbelt Color, Light Saddle
822	Suede leather/Pallex Cloth ('86-88), Ventura Leather/Pallex cloth ('88), 
	Dark Gray ('86-87), Medium Dark Gray ('88)
829	Seat Belt Module, Medium Dark Gray

6XX, 7XX, 8XX and 9XX codes (the "X" can be any letter)

6 code = left front spring code
7 code = right front spring code
8 code = left rear spring code
9 code = right rear spring code

6HY Spring, Left Front, 10034095 (1985-87)
7HZ Spring, Right Front, 10034096 (1985-87)
8WY Spring, Left Rear, 10029092 (1984-87)
9WY Spring, Right Rear, 10029092 (1984-87)

WA-NNNN (N = any number) code on the bottom of the RPO tag is the Fisher Body "WA" paint number. (Fisher Body is the division of GM that produced and painted the car body.) Use this number when buying equivalent paint from any paint supplier. Touch-up paint suppliers such as PlastiKote and Dupli-Color also use this number as a cross-reference. Use the cross-reference manual found by the paint display in your auto parts store to obtain the correct spray can or bottle for your car.

Note that the two digit numbers in the above list (14, 18, 40, 81, etc.) are also paint codes. Some GM cross-references use this number also. If you see something like "81U/16L" it means the upper portion of the Fiero is "81" or Bright Red and the lower portion of the car (ground effects) is "16", Silver Metallic.