Great thread on your rear airbag install. I'm about to buy a 2010 X-cab Z71 4wd and am looking to put the CST 4" lift on it soon after. I'm also looking to install the same rear airbag kit as yours. The CST lift kit calls for removing the factory blocks in the rear and replacing them with 2" lift blocks. How much lift does your truck's rear have? After seeing that you used airbag spacers on your truck, do you think 2" lift blocks would require airbag spacers?