2006 Silverado shock replacement

[TexanAmerican]

I have a 2006 2wd Crew Cab Silverado that is in desperate need of replacing all 4 shocks but I don't know which to replace them with. I saw on another forum people kept saying to use Bilstein adjustable 5100 but when Amazon checked to see if they'd fit my truck it said they wouldn't. So I'm stumped. I'm tired of bouncing everytime I go over a little bump and really want to smooth my ride. Also I plan on putting a 3" body lift on it soon, I don't know if that will affect anything.
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