They do interchange on the 10 bolts and on the d44's I believe also. You really just need the correct rotors and backing plates. There is an early small bearing design spindle and in the later 1970's there is a bigger bearing spindle so just get rotors for your spindles. You can use your same locking hubs and calipers so you don't need to open up the brakelines. No sense removing knuckles unless your ball joints are bad /forums/images/graemlins/k5.gif