still lookin
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Are you looking for a straight replacement of what you pictured (right side, convertible, not aerokit)?
Here's one on eBay: http://www.ebay.com/itm/2005-2006-2007-2008-MINI-COOPER-RIGHT-SIDE-SKIRT-ROCKER-MOLDING-CONVERTIBLE-/172716765768
Or purchase new from a dealer or vendor part # 51717124376 (Google this number for online sellers).
JCW has the same side skirt as a Cooper S, so you should be looking for one that fits 2005-2008 convertible Cooper S. You can also use one from 2002-2004 hardtop Cooper S although you'd have to do some trimming to make it clear the convertible underbrace. -