66 Slant AC Harmonic Balancer question

Deemo said
Sorry. Yes the compressor. It’s late.

66 valiant signet coupe with the knee knocked ac setup. And I only see three bolt holes. I have no clue as to the big pulley either
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It's possible that is a dealer added unit. Can you get some good pictures of the compressor mounted to the engine and the under dash unit? Does the under dash unit have a name on it?