I tried to search the answer but couldn't find the specs for the rear axle U bolts. I need to get new ones when I take off my leaf spring. I need to know the specs and what not.

I believe they're 3 1/4". A quick web search found the following:

http://www.ironrockoffroad.com/Merch..._Code=IR-XUBC8

RE1225 - U-BOLT KIT 3.00" X 9" X 1/2"

This is the rubicon express U-Bolt kit I used for my lift install.

Thanks Evil

I should'a just posted the link instead of relying on memory for the size.