Call whomever you got them from, verify they are correct. (which might be an exercise....... if there aren't any markings on the blocks themselves.) Considering they wanted you to stack the blocks, but, doing so would have one block angled off from the other, that strikes me as a recipe for disaster. If the blocks shift due to the angles they are at, relative to each other, you would lose control of the rear axle, and 'bad things'™ would quickly follow.

 

How about some photos of the blocks so that we can see what you're working with? Have you contacted the Rough Country with this issue?

 

Here are a couple of pics, Im gone get new u bolts and put the oem blocks back in. I will contact rough country and see what's up.

 

 

Here are the blocks I got with my kit
https://www.roughcountry.com/universal-lift-block-kit-6592.html

 

 

Remember to re-torque your u-bolts after 100 miles or so.

 

I was planning on it

 

I really didn't want to reuse the old u bolts, but I was worried I'd get the wrong size online.

 

I'm in the process of swapping my drum brake Dana 60 rear for a disc brake Dana 60 and had noticed that one of my U-bolts had broken at the threaded area on one side. I ended up ordering a new set of U-bolts for it. The issue I found is ensuring that you get the right length. The U-bolts I ordered ended up being the correct items, but I noticed they came with the nuts, but not with hardened washers. Ended up ordering the hardened washers separately. Got the U-bolts and nuts from these folks - http://www.springsnthings.com/