Are they really Bilsteins?

I just purchased a new Z71 Sierra.. crew cab loaded up. I was told by the salesman that it has Bilsteins on it. That is actually one of the reasons I was sold on the vehicle. I've ran Bilsteins for years on my other vehicles, and am convinced they are the BEST shock on the market. My question is this:

I don't think I actually have Bilsteins. Truck rides LIKE CRAP. Bounces and jitters, sways a lot.. drives me nuts. I crawled under the vehicle, the shocks are red and look smaller than the nice yellow Bilsteins I'm used to seeing. Did GM quit putting Bilsteins on trucks and not inform everyone about it?

thx..

Tdturkz71