Brake master cylinder - dual line servo - stamped 74660213Britpart
Fits on Serie 3 88" & 109" with servo unit, june 1980 on. Stamped N° 74660213 on your old master brake cylinder.
Note: The threads of the two holes are in metric M12 and M10, but with a pitch of 1.
In general, the M10 net has a pitch of 1.5 and the M12 of 1.75. So don't try to fit an M10 or M12 screw that you have on hand to identify the thread, it won't fit.
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