var addthis_config = {"data_track_clickback":true}; Carlsson showed up at the Geneva Salon with a new version of its C25 supercar dubbed Royale. Based on the Mercedes-Benz SL 65 AMG, the heavily customized coupe with the fixed rooftop will be built in a limited run of 25 units. Company officials said six vehicles have already been sold and will be delivered to the customers in 2011.