Stark clutch master cylinder for Mercedes For Mercedes W108 Heckflosse: - 280 S (108.016) from 01/1968 to 09/1972- 280 SE (108.018) from 01/1968 to 09/1972- 280 SEL (108.019) from 01/1968 to 04/1971 For Mercedes W109 Heckflosse:- 300 SEL (109.016) from 02/1968 to 01/1970 The clutch sender is located at the pedal and operates the hydraulic clutch control. A faulty sender can cause fluid leakage and gear shifting difficulties.