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Also it has an aftermarket oil pan with external filter housing.
The plug is on the front of the "outsider" . I am not sure what it was there for as I am not familiar with the "outsider" and what the oil flow chamber is like. It sure made a mess though. Hope someone here knows. So far the best suggestion sounds like removing the outsider, tapping the hole where the plug was and installing a bolt.
Photos soon to come. This weep hole is not on the sump it is just above it.
Interesting the plug came out of the front of the Outsider. The pan is intact. I will try to get the pics up for him.For now I would remove the outsider and just mount the pan with internal filter.
DANGER! Do NOT install the lower part of the pan without some kind of spacer, either the Harpers you have now or the factory original. After the factory went to the spacer, they also changed to a taller oil filter. Back in the 850 days the filter was an inch or two shorter, they took advantage of more room to add a larger filter. I have never tried it myself, but I believe there is not enough clearance without the spacer, and the crank will hit the end of the filter.