m code barracuda

not to hijack the thread, but ,does anyone know how to come up w/ a close fender tag for a 68 formula s fastback, not trying to fool anyone cause I`m putting a 440 in it, (505) -----motor plate--magnum force front end---hot resto mod, nostalgia drags and street car. car has had the fender changed before he painted it, and doesn`t have one at all.
any ideas will be appreciated--------------bob