Fitting GT tail lights to a notchback requires an amount of careful body mods and is an expensive proposition. If you want to buy complete GT taillights (housings + new covers) be prepared to pay $600 or more. GT lights really change the look of the notchback but it's an acquired taste. IMO, its not worth the work or the expense when you can buy a custom notchback panel that's a direct replacement. Do a search and you can find pictures of these.
" 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 "