I think that I am right, but it's been awhile and I just want to make sure before ordering these from Classic Industries. Part number #2953 listed for 1970 both B/E bodies. Is there a difference between the years 1966 and 1970s as they only list them for 1970? Will they interchange between the 8.75 (1966 and later) and the Dana 60 rear ends? These are for my 1964 Plymouth Belvedere 426 Stage III Max Wedge that I am also working on while I wait for more parts for my 1964 Dodge 440 426 Street Wedge. The reason that I ask is because I have both the 8.75 (1966 and later years) and Dana 60 rear ends for this car and both have the 11"backing plates. Just taking a step back before ordering. Any help would be appreciated.