This item is used as the 12 o'clock cylinder access plug in the cylinder head on most post-1974 2 valve per cylinder 850, 1000 and 1100cc models starting with the 850T through the 2010 California Vintage.
Also used as the transmission and rear drive filler plug on many later model Big Twins beginning around 1990, thru current production models including V7s, V7IIs, V7IIIs and V9s.
Used as the rear drive box level inspection plug on small twin V35, V50, V65 and V7 models, including Nevadas, Breva 750, V7 Classic, V7 Racer, V7 Stone, V7IIs, and V7IIIs.
And also used as blanking plugs in the back of the engine block on CARC models as well as current production California 1400s and MGX21.
Allen wrench hole filled by rubber plug 93180245 when exposed, and under side is always sealed with o-ring 90706203,