OEM Aprilia Seal Ring (O-ring)
For '08-'15 Mana, Mana GT
This is the Damper O-Ring used on the stabilizer bearing found on the variator. It is a good idea to change these (two required) every time you service your drive belt to prevent chatter or unwanted vibrations.
Sold each. Two Required
Position #16 in the diagram at the link below: