If you want perfect fitment say NO to fiberglass. I tried the fiberglass conversion fenders for my s13.5 and it didn't turn out that great. Spent many hours just trying to make it not seem like so much fail...
Driver side wasn't too bad but the passenger side is a whole different story... And that was after many many hours of cutting/fitting/zip-tie'ing etc. I will be going OEM metal cut and weld when I have the funds.