496858 is RH bracket for '75-'81 A-body, '78-'81 G-body, and '77-'81 B-body. It's the lowest height of the clam shell motor mount brackets for Pontiac engines.
Seems unlikely the factory would have built it that way as it would cause the engine to be tilted. Parts book lists 496892/496893 for '75-'81 F-body.
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