'03 Tahoe Ss2 Wheels

I am purchasing a leftover 2003 Tahoe Z71; white. However, there is a black one at a local dealer. It has a set of very nice 20" aftermarket wheels on it, but I can't seem to find out who makes the wheels. I was told by the dealer that it is a company that makes aftermarket GM parts/wheels. I have seen them on the Avalanches and Yukons, etc. The centercap reads SS2.

Does anyone have any idea of the manufacturer? I would like to purchase the white Tahoe and purchase the wheels after. This, knowing that for GM to put them on a new vehicle and warrantee them, they must be quality.

Any ideas?