In a week or so I'm going to slide under the coach and back out the plug a bit and measure it with calipers just to make sure I get the correct one.
I'm not a fan of messing with oil pan drain plugs and never ever install the plug unless you tighten it to spec, we had a mech just start the plug, and filled it with oil and never finished the plug, guess what a in frame costs after the plug came out.
When we started using the valve drain plugs we would safety wire the handle so there was no way it could come open in flight.