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O/rings, my stash of them in the shed, never been caught out yet. Resupplied by the local Bearing/oil seal company as needed.
No stash, NO problems, take the sample to a said suppler, and simply ask for "one of these please in Viton".
Names, I think?????, "elbow, oil pump Inlet, Relief cooler system".
The key here is to make sure you replace with Viton o-rings. All sizes seem to be available at McMaster-Carr, you just might have to order more than you need, and there will be a shipping period....
There is a similar (if not the same) o-ring at the base of the filter housing where it attaches to the sandwich plate. But again, scant info on the specs