Ouch. Yep, that's why if the opti comes off, the seals get done. Doing one or the other just means doing it again.
As for the other o-ring, it could be a spare. I don't see any other spot it could go other than the water pump drive.
EDIT: Looks like there's two O-rings on the water pump shaft, so there ya go.
water_pump.jpg
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