48k-Mile 2007 Mercedes-Benz SL550 50th Anniversary Edition 1 of 550 50th Anniversary Editions w/Low Miles & Clean Carfax. This 2007 Mercedes-Benz SL550 is one of 550 cars produced to commemorate the 50th Anniversary of the SL. It is finished in Pewter Silver Metallic (723) over Cognac Brown (227) leather and powered by a 5.5-liter V8 paired with a seven-speed automatic transmission. Additional equipment includes a power-retractable hardtop, bi-xenon headlamps, Keyless-Go, Active Body Control, heated and ventilated multi-contour front seats, and COMAND infotainment with navigation.