Adapter for the rubber bellow - bellows BMW part no.: 33172311528 when converting to the cardan shaft adapter part no. 261889
The adapter is needed when mounting a 1100 er / 1150 er swingarm from the motorcycle type BMW 259 when installing in a 2-valve with 2V 5-speed transmission.
This prevents the penetration of dirt and moisture into the swingarm. The bellows must be modified for installation.