Have you checked the diameter? Typical aftermarket rear bars I've seen are 1-1/16" or 1-1/8" diameter. I've used Hotchkis and they are black. I've also seen a few thicker than stock diameter GM bars that are also black.
Beltran’s are gray and the rear one doesn’t fit and rubs against the rear differential even though it’s advertised to fit. Anybody want mine? It’s just sitting on my garage floor waiting for the opportunity to trip me again.