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May I recommend Century Auto Air? Get their European import O-ring kit. I'm using this for my 940 ac works. Reasonable price and very good quality. Lots of O-rings for other connections and accumulator too. What Machine Man mentioned is spot on - the inner diameter (ID) of the O ring is about the external size of an ac pipe, only its outer diameter (OD) is unknown. Having a kit should help tremendously.
Here's the link:
https://www.shopcenturyautoair.com/store/c12/O-Ring_Kits.html
Regards,
Amarin.
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