If you are talking about the o-rings, i didn't replace mine when I pulled it apart so I never investigated about them. I gambled that mine would still be ok. It held vacuum for a while so good enough for me. The only other seals would be from the shaft which I don't remember seeing or a couple of fittings at the very bottom also no recollection. Basically, I am no help whatsoever. I would call that Adam guy though, he seems like he knows everything about the ac.

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2010 Lexus RX350 still new
2003 BMW X5 3.0i w/sport package w/68K miles. (gone Thank God!)
2002 Dodge Ram 2500 4X4 cummins diesel w/198K miles, custom repo truck
2009 Scion tC w/46K miles
2007 Suzuki SV650 custom streetfighter
2000 Lexus GS400 w/165K miles