67-76 floor into a 65...

I put later individual floor pans in a 65 Dart years ago When all there was was 67-later individual repair panels. As i recall they had to be massaged to fit.
Massage to fit. That's a good phrase to use. The 67 and newer cars are wider so there will be some trimming and fitting involved to make them work. They make pans for the 63-66 cars. 1962-1966 DODGE & PLYMOUTH A-BODY COMPLETE FLOOR PAN KIT-4 PIECES