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.
59C1 R850C 99- (0421)
59C1 R1200C 03- (0329,0379)
59C1 R1200C 97- (0424,0434)
59C2 R1200 Montauk 03- (0309,0319)
59C3 R1200C Indep. 00- (0405,0433)
59C3 R1200C Indep. 03- (0362,0391)