Please explain. It sounds like you are using a Fiero axle that has the Fiero inner tripot with an outer S-10 tripod. If that is the case the MT passenger side axles still seem to be available. Try Rock Auto for a Cardone rebuilt unit as I have doubts that the new Chinese imports are built exactly like the GM units
" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "