My understanding is that the critical dimensions for the spindles from the early 60 thru the late 70's fullsize ford cars are close enough that this is a bolt on swap and there fore should also work on the 65. The reason I was given for using the later spindels (74-79) is that the availability of rotors calipers etc is better/cheaper.

As far as the grenada swap, I really didn't research it too much as the drop was not something I want for my project.