I vaguely recall discussing this here.
My 11D '64 GTO Fremont build has the metal cover.
Mine has a code stamped on it, can't make it out, but might be the stamping plant date code. 3 characters, 1st character spaced a bit apart from the other 2. The 2 characters "might" read 36. Most of my stamping date codes are in the range of Z40 to Z44 (40th to 44th week), 36 would not be much out of line.
The part is called the Hydraulic Motor & Pump Shield and illustrated in the MPC. However, it indicates that it is N.S. (Not Stocked) so no part no. shown for it, it was not offered for service.
However, in Gr. 14.481, you can find this:
Two different Motor Assemblies listed for the '64 Tempest Custom & Lemans Convertibles.
The p/n 5044573 is indicated as 1st Type w/ steel pump shield.
The p/n 5044586 is indicated as 2nd Type w/ foundation board pump shield.
The 2nd type is shown in the '66 MPC as '64-'66, so this suggests a running change during '64. The 1st type shows '64 usage only.
Similar notations for the '64 big Pontiacs, suggesting a running change to the "foundation board pump shield" for the revised motor assemblies used in them also.
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