Splined drive ring Should be replaced in connection with a repair of the drive toothing. This part is manufactured in Siebenrock quality and is no longer available from BMW.
You need for the assembly 10x button head rivet art.no. 0711165.
For BMW classic airhead models R 50/5, R 60/5, R75/5
Compare: 36311230325, 36-31-1-230-325