OEM new is not available stateside, but appears to be available from Japan for about $900-950 shipped. I don't trust their shipping quotes, so that's the reason for the price range.
https://www.amayama.com/en/part/nissan/9260067u61
Should you need more air conditioning work, I'd look in to a guy who has a Youtube channel I like. He can be kind of abrasive in his videos, but he really seems to know his stuff and he's in your area.
https://www.youtube.com/channel/UCqCDCZ ... byxwNgus1g
Lech Auto Air Conditioning - (415) 860-7211 - 280 Hamilton St, San Francisco, CA 94134.
He has a lot of videos where he's repairing vintage stuff from the 70's, as well as modern systems. When I was working on my 90's air conditioning last month, I asked a question on one of his old videos, and he answered it overnight. Seems like a really good guy.