I have a 2006 GMC 2500 HD and want to install the nickel plated Bilstien's. In the rear I am installing a 2" block so I am not sure what shock I need. Most that I have seen say they will work with a 0-1" lift, but if I put a 2" block in I will already be over extending the shock.

I'm getting ready for a 1.5" block. I bought a set of 5100 series Bilsteins from Nick@Norcaltruck.

He's a supporting vendor here who has very fair prices. The rear shocks are 2" longer then the front.

Give him a call and I'm sure he'll hook you up.