Anyone Know Bevel Box Drain Plug Thread Size, Pitch, Etc. For R3t

Does anyone know the size of the bevel box drain plug - bolt size, pitch, etc. I have to repair with a Heli Coil type insert and I need to know what insedrt kit to get. I could use another size, of course, but it would be nice to use the original type magnetized drain plug. Any Triumph Parts guys here or anyone who can measure one? I could order one but it will take weeks or even longer to get with the coronovirus slowing everything down. I'd like to get the insert installed in the meantime.

I emailed Triumph but never received a response.