8 1/4" rear changeover suspension parts

As for the shock plates, the 7 1/4 ones can work, all you have to do is drill your holes on the plate about another 1/4'' or so, in other words make them oblong. Drill towards the outside of the plate. That is the only difference between plates.
As for the drive shaft, makes a difference on which trans you have, they are not all the same lenght.