I've installed the Bilstein blue/yellow shocks on my 07 2500 4x4. My question is about the center nut on the front shock tower. I've got them tightened all the way, but the top of the nut is pretty much flush with the top of the shock. With the shock came the new bushing kit. In the kit was a metal collar which goes in the center of the bushings. When you tighten the nut it bottoms out on that sleeve, preventing you from tightening anymore. I just want to make sure the bushing have enough tension on them. Thanks for any help.