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gimme a day...
iirc, its a male straight threaded pipe style fitting,about 3/4" diameter, the petcock attaches to with a collar and gasket ring.. the petcock has a removable "bowl" at the bottom, and an internal screen.
but I'll try to take a pic..
I saw "police" versions for later year models, that had a similar 2 hole screw plate mount, like Concours C10's, mine is not like that.. so if it's a male threaded intake port, or 2 hole flange.. doesn't help me.. just mentioning..