The R170 Mercedes SLK is based on the SLK I Concept, presented during Spring of 1994 at the Turin Motor Show, and SLK II Concept, presented during Fall of 1994 at the Paris Motor Show, which is a two-seater roadster concept car that features a folding metal electro-hydraulic roof, dubbed 'vario-roof' by Mercedes, and takes 25 seconds to operate.[5][6] A German design patent was filed on 30 September 1993, with the final production version of the SLK introduced at the Turin Motor Show on 22 April 1996.  The R170 SLK is based on the W202 C-Class platform, sharing many drivetrain and chassis components, as well as using a shortened version of the floor pan.[9] The wheelbase is also identical to the wheelbase of the 190SL and 300SL, at 2,400 mm (94.5 in. The platform of the R170 Mercedes SLK is also used by the Chrysler Crossfire, which shares 80% of its components with the car.