I Have a 94 Sierra K2500 Standard Cab and trying to figure out what the plastic interior piece is called below the rear window. It is either, Rear Glass Molding, or Inner Panel. The piece am looking for is roughly 9" in width. I have looked on GM Parts Distributor and the molding and the panel look the same to me. I need another one due to the fact that my old one is now in pieces. Thank You in advance.