Molding around back hatch glass
GM changed this molding very early in the 2001 model year (it was previously glossy, and changed to a matte finish), so I doubt you could get anything new from GM to match the earlier finish which would have come stock on your '99 car. In fact, I think I've heard that even the later matte version has long since been discontinued. Not sure about aftermarket versions, I haven't looked into this myself.
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They all sais you install it without removing the glass, you slowly roll it onto the edge little by little all the way around. You could also remove the moulding completely and fill the void under and around the glass with black urethane until its even with the glass edge and the body of the car, then smooth it out. Let it dry.












