Its a fiberglass piece that I purchased from a retailer in Florida
www.directcartoys.com
(they sell on Ebay as well). After researching numerous spoilers out there, regardless of price or prestige, I found that there wasn't much that distinguished one brand from another when it came to such a simple accent piece as this. However, according to my auto body "guy", like most fiberglass aero parts, it required a fair amount of reshaping and tweaking in order to make it fit perfectly. Overall I think it proved to be a good final touch on the project .