I don't know about interchange years, for sure, though I would guess 64-66 at least would be the same; but the bench seat brackets are completely different -- no resemblance to the bucket brackets, and they attach to the seat totally differently.
I suspect that brackets up through 65 will interchange. 66 Brackets are different on the mounting studs to the floor spacing and I suspect different on the seat base mounting as well.
i have a # of 64 -65-66 seats all good frames and sliders if you would like to buy some 175.00 for a set and you pay for shipping or you can pick up its 18 hrs here to valadosta if you want to take a ride you can do it in 1 weekend took me 400 in gas in my ram 8 years ago lol
Thanks, 65 Dartman. I always wondered where they lost the 2" of seat width for the '66 model year. I have a couple sets of MOPAR bucket seats on the shelf and the side to side measurement is 15" +/- on both sets.
Bob