Rebuilding the MC as it was original. Ordered a rebuild kit. Then a second one because I thought I made a mistake. Both came in with a smaller diameter kit than what is on the bike. Plunger was about 1MM smaller. Could this be because the MC came from an older model and used anyway at the factory? I was told the entire brake system is original. Would anyone know if the rebuild kit for a 73 cb750 master cylinder uses the same kit as all bikes from 70-78? THis one has a clear plastic reservoir. Thanks in advance!