One new original Bosch brand ignition rotor, part number 1.234.332.197 or Bremi # 9083.  This fits:

Alfa Romeo GTV 2.5L 2492cc 11/1980 - 02/1987

Mercedes Benz 280S W116 08/1972 - 07/1980

Mercedes Benz 280SEL W116 08/1972 - 07/1980

Mercedes Benz 280SL R107 08/1974 - 1982

Porsche 911SC 3.0L 2993cc 08/1982 - 07/1983

Porsche 911SC Carrera 3.0L 2993cc 07/1977 - 06/1980

Porsche 911 Targa SC 3.0L 2993cc 07/1977 - 06/1980