A couple of things to note from the cast bracket listings:
The '64 P/8 apparently used both versions, with a change over to the aluminum front bracket system at some time. The '64 T/8 always used the stamped front bracket. My car was an original A/C car. When we built the engine, we reused the original 9774770, 8" long cast bracket. When I tried to install the aluminum front bracket, I realised something was wrong. I switched to the 9776460 6-7/8" and everything lined up. I do see that for some reason, the '65 cast bracket changed to 9779015, even though it uses the same front aluminum bracket. What part numbers do you have?
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'04 GTO Yellow Jacket, A4, Kooks, CAI, etc.
'02 Firebird, V6, auto
'68 GTO Convertible, HO, 4spd, driver
'66 LeMans Hardtop, 400, FI, A/C, 4L80E.
'65 GTO Hardtop, restoration ongoing
'64 GTO Hardtop, "389", Tri-power, 5 speed, A/C, Yorktown Blue.
http://www.gtoaco.com
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