Rocky, you may be two thirds in luck. According to 1966 Pontiac Chassis Parts Catalog, 1939 through 1957 standard transmission Pontiacs (straight 6, straight 8 and V8) use the same rear motor mounts (522657 on the left, 522656 of the right). The front mount has a part number 508748 for the straight engines and 761748 for the bent-8.
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My Pontiac is a '57 GMC with its original 347" Pontiac V8 and dual-range Hydra-Matic.
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