The turn signal stalk on the Fiero varied with certain options such as windshield wiper controls and cruise control. Equivalent stalks were used on many GM cars of the same era. OEM replacements with delay wipers and cruise are still available under part number 25111290, although they are flat black instead of shiny. Aftermarket units are also available, typically in the "Help" brand of parts. The "Help!" brand P/N 49286 turn signal stalk listed for the '88 Fiero is better quality than for earlier years and will fit all Fieros, so use the one listed for the '88 if available.
A turn signal cam (a part that's inside the steering column and wears out with age) listed for all Fieros is Help! 49303.