I dont know if anything extra has been done to MMS's cosworth CS600x, or how much freight is to get one here, but considering the dollar, have a look at these.
http://www.tarmac-usa.com/index.php?productID=344
http://www.vividracing.com/catalog/c...6-p-35088.html
Actually, I didn't even know MMS was a paying vendor on this site...