Hi Nige,Look in the 9J-0365 & the 9J-8554, Replenishing Valve (LH & RH). The seals are listed in both.
You need #10 & 11 - 4J-8996 Seal O-Ring, and 9J-8086 Ring - Backup
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thank you very much for your quick professional help!
Unfortunately, I missed this drawing in the parts book. (Unfortunately, I don't speak English and I use Google translator and it often doesn't work exactly, so it makes it difficult to interpret accurately.)
Yes, we agree that this is a worn O-ring and it is probably leaking. I thought it wasn't cracked or torn.