The shock plates will work if you elongate the holes. The inside dimension on the 7.25 u-bolts is 2 1/2", on the 8.75 it's 3" so you will need to elongate the holes 1/4" to the outside on each side. Been there done that and it works just fine.
Also, don't forget you will need to shorten the drive shaft about 1 1/2".