Stock u-bolt size 99 5-lug

Does anyone know the stock u-bolt size on a 99 5-lug? The previous owner of my truck used lowering blocks to bring it down 3 inches in the rear.

I want to remove these to raise it back up to stock height but the current u-bolts are too long (not to mention they are rusted and one is bent underneath the bolt).

Does anyone know the size of the u-bolts I need to buy? Does it have to be exact or is it just anything that will fit the axle (which I believe is 2.75").

 

here's how you measure yourself brosef
http://www.generalspringkc.com/index.php?p=catalog&parent=32&pg=1
and a great place to purchase to boot...

I believe my 98 stockers were 3" wide and the nut uses a 3/4" wrench making the rod a 1/2"

 

Thanks man...this is perfect.

 

This^ axle tube is 3" and bolt size is 1/2