There's a company online now that sells new metal for these areas. They have a simple name like "window frame metal" or something like that. Hopefully you can find them if you need these parts.
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1968 GTO - 400/400 - Currently being rebuilt - 455/T56
1996 WS6 - LTI M6 - Sold 5/11
1979 Trans Am - 403/Auto - Sold 12/18
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