This link to ebay came up on another forum. Seems to be an 'interesting' approach/alternative for what you're looking for...
http://cgi.ebay.com/ebaymotors/1990-2002-99-Mercedes-Benz-SL-Class-R129-AMG-Body-Kit_W0QQcmdZViewItemQQcategoryZ36475QQihZ010QQitemZ200166508532QQrdZ1QQsspagenameZWDVW
I have no first hand knowledge about the manufacturer, it's products, quality, etc. other than what I read here. Like tecqboy, I just had mine repaired/resprayed and they do turn out well. Had I known about this kit, I'd have been tempted!
Bob