Convertible tonneau cover
This seems a rare item to me. I have seen it in pics of the prototype, but apparently they were sold as well. I don't know if it's useful (my heater works great, hairs burn almost of my legs, and no wind thanks to the deflector!), maybe in a Spyder version with perspex window?
http://cgi.ebay.co.uk/Midas-Gold-Kit-Ca ... 286.c0.m14
http://cgi.ebay.co.uk/Midas-Gold-Kit-Ca ... 286.c0.m14