I had the same issue. I pulled my windshield and a prior owner had bondo'd the windshield channel. 2/3 of the channel was gone. I had a body shop fab-up a channel and weld it in. It looks factory!! It seems as though it is a common issue
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1967 Chevrolet Impala SS convertible - Ermine White C1 1967 Chevrolet Impala SS 396 - Marina Blue FF 1996 Chevrolet Caprice Classic LT1 2001 Ford F250 CC 4x4