U bolts shock plates 7 1/4 to 8 3/4

Ok my 7 1/4 will so be history,I am swapping in the 8 3/4.I will need to get new U bolts.I have 5 leafs in now and plan on installing one more for a little lift.Anyone done this swap not sure if I need 7,8,9 inch.I am working on a 69 Dodge Dart.Thanks.

 

How long are your current U bolts?

I believe the 7 1/4" rear has 2 1/2" diameter tubes and an 8 3/4" has 3" tubes, so that adds a 1/2". Any extra leafs adds another 1/4" each or so. I'd go with U bolts 1" longer then your current u bolts, should leave you enough extra threads to make it work and not be too long. Gene