My local Goodmark rep and resto shop said the 67 maro fender and inner fender works on the 67-68 Firebird but needs an inner piece trimmed in the front due to the Firebirds unique bumper-grill assembly. Never really looked into it, just passing it along FWIW
Wanting a Custom fit in an off the rack world.
I don't have time for a job, I just need the money.