If anyone is ever in the same situation as me, I found a GM rubber bumper that will fit in a 3/8" hole. It is very close to the same dimensions as the original glass stop bumper. The GM part number is #15029828.
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1966 Corvette Coupe L79 Mossport Green
1969 Camaro Z/28 Hugger Orange
NCRS #22211
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