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Also, I spoke with SNG Barratt here in the U.S. about these oil cooler lines in mid-April. They quoted me a full kit to replace all components in the system. Their quote included oil cooler feed hose C2N2911, oil cooler feed hose C2N2208, oil cooler return hose MJE7471AB, oil cooler return hose MJE7461AB, 4 O-rings KSR609001, and 2 O-rings KSH119530. So these parts may still be available through SNG Barratt (although they are stupid expensive)....
Yes, I replaced the O rings, I have a few o ring kits and just matched up with the closest in the kits, the closest match came from an imperial rather than metric kit.