Here's another option if you don't need u-bolts. Again, no experience with the product or seller.
http://www.ebay.com/itm/1992-1999-Chevy-Suburban-1500-1-1-2-Inch-Billet-Rear-Leveling-Lift-Blocks-/281820578905?fits=Model%3ASuburban+1500&hash=item419dd0c459:g:xt8AAOSwPCVX8~05