You were overthinking the problem.6 3/4 (or oversize 6 1/2) fit without manufacturing a bracket. Conversely if you are trying to use a standard 61/2 you can sort of remove the bracket from the old speaker,destroying it in the process,but leaving you with a bracket.
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2007.5 Silverado HD2500 4wd crew Duramax/Allison
1996 excab short bed 2wd 2500
1994 regular cab 4wd 2500 cheap Cheyenne pkg
2003 VW Jetta TDI
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