Will 4th gen stock wheels be an exact fit for my stock 3rd gen?

no you will need spacers. go to hawksthirdgenparts.com they sell the spacers for 3rd gens for 4th gen rims

Yeah dont go with ebay wheel spacers they SUCK! or at least mine did....

damn... oh well. I 'll wait and save up.

You should contact andris skulte www.skulte.com , and beg him to make you a set of his adapters. I have one for my C5 wheels and they are great, but word I heard is that he is not making them any longer.

Any 4th Gen wheel with the correct spacer will fit. I'm running 94 T/A wheels that are 16x8 +55 offset. Up front I used a 2.25" spacer and in back I used a 1.50" spacer. With those spacers the front whees are now a zero offset wheel and the rears are a +15 offset wheel which are the same as the stock GTA lace wheels. Here are some pics. I got the spacers from www.ezaccessory.com I would suggest them, they're very high quality. Also I can help you figure out the spacers you need if you want.

Features:
6061 T6 billet aluminum
CNC machined
pressed-in studs included
open end lug nuts included

Rob...