Mark, just saw your post on this. I don't know if you found an answer yet but here are the numbers I found: Long Bracket mounted (Welded) on rear floor-10276577
Left Side Disc Changer Bracket-10274252
Right Side Disc Changer Bracket-10274254
Plastic Nut-10027015
You will need a hex nut (M8X1.25) to hold the changer bracket (10274254) to the long bracket (10276577).
Most if not all of these numbers are discontinued but you may get lucky and find them in a salvage yard or you can try and fabricate some mounting brackets yourself.
Good Luck
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1967 Pontiac GTO
1965 Olds Cutlass
2014 Ford Mustang
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GTO-The Great One for 1967
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