OEM !!!
Ohh and to answer your question mate there are a few dif manufacturers. 2 of my mates run Carbon Bonnets ( hoods ) - Lee has the Spoon one, very very light but very very expensive and John has the Seibon one. The Seibon one is the better finished of the two to be honest as the Spoon isnt pretty underneath, just rough fibreglass.
There is also Varis and many other makes, buddyclub etc.
Cheers, Andy