The 1965 parts manual that I have list Part # C4GY 1007-B as fitting
( Fairlane Series, (X) Falcon and (F) Mustang. The car that I was working on did't have any modifications. The stainless steel calipipers are a direct replacement for the 4 piston orginals. My parts book lists parts for 1965 Ford Motor Vehicles only. Poboy 427 your statement makes sense. I don't know for sure what the deal is. I do know that I had a problem. The next time that I have my car in the shop,I'm going try some wheels from a drum brake car on the front. Stay tuned.