Changing from 7 1/4" to 8 3/4" rear end questions

SGBARRACUDA said
The 7 1/4” U bolts and shock plates are different. 7 1/4” has 2 1/2” tubes. 8 3/4” has 3” tubes.

I have a set of u-bolts and shock plates for the 8 3/4". Thank you.