Thanks BlackTop Vinyl! I noticed Ed-Morad has at least one steering wheel with the audio controls, but their ebay listing says "We do not know how to put a wheel with radio controls on it in a car without radio controls."
So that's my dilemma. My '03 doesn't have radio controls in the steering wheel, but I'm wondering if GM would have run the wiring anyway? Or would I have to find the wires and run them from my radio to the steering wheel? Or would I need a completely different radio unit? Does anyone know?