33157600 Cap Adaptor 21C Cadillac, Chevrolet, Daewoo, GM, Saab 056100V2 Includes 6 x M12x150 plugs 80240000 Includes 6 x M12x150 plugs & 6 x M14x150 plugs Brand Model Years Audi A6 1994–1997 Audi A8 1994–2002 Audi Cabriolet 1991–2000 Porsche 911 1997– Porsche 911 Convertible 1998– Porsche 911 Targa 2001– Porsche Boxster 1996–2011 Porsche Boxster Spyder 2007–2011 Porsche Cayman 2005–2013 Smart Cabrio 2000–2004 Smart City Coupé 1998–2004 Smart Fortwo Cabrio 2000– Smart Fortwo Coupe 2004– Smart Roadster 2003–2005 Smart Roadster Coupe 2003–2005 For more specific application information download the applications list here 331595V3apps For older systems with a threaded connection Zafira Tourer All Engine Sizes (2011 )