Quite simply the answer is NO. mid 60's for stuff changes often and interchanges with nothing readily. Changes to these cars are most easily accomplished with swaps to later model spindles If i am recalling correctly the distance between the bearing races never changes so Yes the rotors could be made to fit with a set of specialty bearings from a proper bearing supply, 65 / 6 mustang drum and disc use the same spindles with small spindle pins, the mII stuff is from the generation of large pins so it isn't direct. . there are no readily available caliper brackets and nobody ever bothers with the swap. mostly because you can't whip it up with junkyard parts, wheel selection sucks, the rotors are to small for the effort so the aftermarket has zero interest in making one. You are still adding 600 lbs to a car that had too small a brakes in the first place