The R75/5 seat had an insignia on the rear of the seat showing that it was an R75/5. The R50/5 and R60/6 were plain.
The part number is 07 11 9 901 690 and is a LIN SK SHR 4 X 10 countersunk screw 4 mm X 10 mm.
Edited 6 Oct, 2020
Duane Ausherman BMW motorcycles
What I can remember after decades of working with BMW motorcycles
The R75/5 seat had an insignia on the rear of the seat showing that it was an R75/5. The R50/5 and R60/6 were plain.
The part number is 07 11 9 901 690 and is a LIN SK SHR 4 X 10 countersunk screw 4 mm X 10 mm.
Edited 6 Oct, 2020