I cant look at my truck right now to see for myself so... can I fit 1" blocks with the stock U bolts?

Yes I made a 1 inch block and was able to use the stock u-bolts, just enough threads on bottom to tighten down. about 1 1/2 threads were showing after install. Been runnin it like that for a while now with no problem.

Thanks, I got to look at it and i think it'll work.