Dude, don't waste your money on them, from experience.. I bought the fiberglass stalker bumper from cervinis and a 93 fiberglass cobra from ABC. Both were pain in the ass to make fit, abc one was worse. I didn't line up right and it sagged bad.
Just pay the extra money for some urethane ones. I just installed some OEM 93 cobra side skirt and if they didn't have any give to them, no way they would bolt-up.