6” Lift kit

I’ve been looking for a 6” lift kit for my 03 1500HD 2WD but RC says it won’t fit it’ll only fit for the 2500 BDS as well says it’ll only fit for the 2500 can anyone point me in the right direction.

Can I put a 2500 6” lift kit on my 2WD 1500HD? And if so what brand should I get.

I do want to throw on 35’s or 40’s on a 15” or 16” wheel think it’ll fit with a 6” lift ?