Digging through my inventory i found these two sprockets. I wonder if these sprockets marked "450" are made for the 450 dohc? they dont have the edge and are about 1.45mm smaller on each side.
other one is marked 750. Could it really be as simple as purchasing one of these sprockets to enable oring use? i havent measure the pitch etc on the sprocket but judging by eye it seems to the same as the other sprocket.