Have a 09 Sierra 2500hd and going with 11-14 Sierra 20" rims. I'm question is the wheel adapters is there all the same? Or what ones should I go with? 1.5" or 2"?

 

I run the 1.5" wides on my 04 Sierra 3/4 ton and it sets the factory 20's at basically even with the edge of my fender flare. I think the same on the GMT900 would be about the same result as the frame is identical and I don't think the body is really much wider.

I like the 20's from the 16 and up All Terrain and Sport Chev's... still the exact same center cap and design as the polished versions from 11-15 but have the pockets and inside the rim painted dark metallic grey. I have 3 sets of them haha. One set on the 2017, one set on the 04 and a set of completes as spares lol.