The notchbacks and the Fastbacks use different trunk lock cylinders. Both will interchange but the notchback lock cylinder is slightly shorter in length than the ones used on the fastbacks. The complete set advertised on eBay is $149.00. IMO thats pretty steep .I've never owned a Fiero where one key fit all the locations for ignition, door and trunk.
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" 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.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "