GM made them cheap.
86 and older... RA and others have simple hub to mount whatever pulleys. GM 22P listed as Hub, CR/SHF Pulley 10028930
# 85 on image at
http://parts.nalleygmc.com/...14247&modelYear=1986Many/all 87 & above didn't have one either. To save more money this is one piece and just slips on/off the crank.
Maybe 91-92 had them from factory... They switch to timing chain setup so could be.
Fluidampr is likely only option.
www.fluidampr.com/products/...=PONTIAC&model=FIEROBut I'm not sure if that works on Fiero w/ stock V belt setup. I think that moves crank pulley 1+ inch.
It won't work on 87 serpent belt setup. Balancer is also crank pulley. I've install the Dorman one this week.