You can install this oil level control (also called oil level glass) if your original oil level control is broken or yellowed. Exchange it when you do your next oil change. Sometimes it is easier to break the glass of the old oil level control in order to remove it.
259R R850R 94- (0401,0406)
R28 R850R 02- (0428)
259R R1100R 94- (0402,0407)
R28 R1150R 01- (0429,0439)
R28 R1150R Rockster (0308,0318)