No. The 2500/3500 are not. But the 3500 drw is. It would be easier to install just one part on numerous trucks than it would be to have different parts for different trucks.Asking this question because I don't know. Are you saying the GMC 2500 is 80" but the Chevy 2500 is not and doesn't require them? I know they are different trucks but also the same truck in many ways.
I have no idea what chevy is doing. Sorry.