Parts such as the Transmission: Gear,1st Driven(nt:27), Bearing(17x40x12), Gear,fourth Driven (nt:21), Retainer are included in the Rm250 2000 (y) Transmission parts fiche.
On this parts fiche the O Ring(d:1.9,id:21.8) is the most specified component.
This Transmission diagram displays the required parts for the Rm250 2000 (y) Transmission.