Manufacturer: Autobahn Dismantling ____________________________ Vehicle Compatibility: Porsche 911 964 Carrera 2/4 (1989-1990) ____________________________ Notes: The pre 1991 rear shocks are slightly different than the 1991-1994 rear shocks. The 1991 and later use a taller spring and the upper shock mounts are different. This custom made billet aluminum adapter/spacer plate will allow you to run the later shock style by just placing it on the upper shock mount. Very simple installation. They are 20.5mm Sold as a pair. $149.99 gets you a total of 2 plates or 1 set.