This Genuine Ducati Engine Opening Rocker Arm is the perfect addition to your motorcycle. It is the RH Right Side with OEM Part Number 20810018A and fits models including Monster SportTouring ST4 ST4S Superbike from 2001 to 2006. Made in Italy, this Rocker Arm is of high quality and durability. It is ideal for those looking to upgrade their motorcycle's performance and reliability.