I tried it with my 71 cuda using 70 fenders. On the 1970 fenders the headlight bucket is welded to the fender, on 1971 the dual headlight buckets are bolted to the fenders. On 1972 and up the headlight buckets are also bolted but as Chryco said they have a different marker light which would add one more thing to change. Your best bet would be to find 71 barracuda fenders and weld in the gills, or do a little massaging to the 70 fenders by removing the welded buckets and welding in the backing nuts so that the dual bucket could be bolted in.