[longbed67]

I just got in a few sets from thorbecke bros they measure 5-7/8 diameter and 2-1/4 tall and I usually trim them down to 1-1/4" tall unless you are looking to lift the front of your truck. I would definately make them larger in diameter to match the bottom of the plate on the air bag.

Not to rip on you mxjunkie80 but bigger isnt always better because as long as the height of the lower cup allows you to clear the bag on the control arm when completely deflated then you are just adding unecessary weight to the system.