The JCW Aero Kit I and II are very similar except:
Fits the following models with the Factory JCW Aero Kit II:
2007-08/2010 R56 Cooper S Hatchback
2008-08/2010 R55 Cooper S CLUBMAN
2009-08/2010 R57 Cooper S Convertible
Left Side Lower Width Extension. (Driver side on US models.)
For other options, see G2NMX7500-P.