Misha Design is introducing an all new widebody package for the current generation Mercedes SL, but the kit can be applied on all models starting from 2003 onwards. 
This Misha Design Mercedes SL Widebody conversion adds elements like a redesigned front bumper with larger and more aggressive looking air intakes, a carbon fiber chin spoiler, wider fenders that resemble the ones featured by the SL Black Series, a vented hood, new side skirts plus a carbon fiber diffuser.
The Misha Design Mercedes SL Widebody also contains a rear trunk spoiler for increased downforce, and pricing details are available upon request.
Misha Design press release :
The kit includes an all new front bumper with lower Carbon Fiber lip spoiler.  The larger and more aggressive openings draw in more air to cool the powerful AMG Mercedes.  The fenders are wider similar to the SL Black Series and are functional drawing air out from behind the front tires.  The hood is an all original design with carbon fiber slats at the top where it is vented.  The Side skirts flow smoothly into the new wider rear fender flares.  The rear bumper comes with Carbon fiber gills and a carbon fiber diffuser that helps channel the air and to increase downforce.  The rear Trunk spoiler is also designed to increase the downforce.
This kit is made for all SL Mercedes 2003-Present.  The kit is a direct bolt on for the 2009 and newer models.  This kit also allows you to convert your pre 2009 SL to the new facelifted 2009 and newer SL Mercedes. The kit includes everything your will need except for the headlights and center grill.