I don't think so, plus doesn't a 74 Cougar have the "big car" bolt pattern 5X5.5" or something like that? I looked at rotors to fit my "custom" set up and I found that a 72 T-bird rotor will mount to our spindle but still has the small car (5X4.5) bolt pattern, but they are very hard to find and very expensive! They use those rotors for the Boss 302 trans am cars, but other that that they don't fit anything else.
