I bought a set of 72 spindle assemblys for my 68, but I haven't put them on yet. I was told they fit great, just use the 72 tie rod ends and you will need to use spindle bearings, seals and rotors for the 72. The axle shaft is a different size(larger)than the 68's. Everything else is supposed to be the same(upper and lower ball joints). You will also want the proportioning valve from the donor car if you can get it, or use an aftermarket one.