Circling back on this.
This particular example (2020 390 adventure) had a low oil pressure warning light going off.
Drained the oil and found several ounces of coolant. Refilled oil. Tested oil pressure at the filter housing. 30+ psi at idle.
Replaced both seals as detailed and discussed...
Roger that and thanks for confirming. My part number for the 450 XC seals is 77335057000. Agree on the weep hole concept too. If anyone trashes a right side cover and can spare it for science, would be good to see how to add one without impingement into an adjacent cavity.
Thanks! I have a variety of seals on hand (the OEM water pump kit and a few extras) including the 450 XC seals which I had planned to use based on your / other's successes. As was noted above the 450 XC seals are not as thick as the OEM units. I'm assuming the best move is locate the seals at...