When I was loking for one of those plugs, I went into a GM dealership to confirm that they would laugh at me because it was more than 10 years old! To my amazement, the guy looked through some catalogs and then sent me down the road to a jobber. The jobber had them in stock. I am ashamed to admit I don't know what a jobber really is or how they fit into the chain. Anyhow, I bought several and that was good because six months later I had to replace the one in the rear.
