Ferrari, Maserati, Lamborghini Parts - Ricambi America, Inc. Try these guys they have them. I'm going to get them myself also had them on my 355.
If its easier those at Ricambi are made in the Uk (I think) and can be ordered direct from Hills Skid Plates - Hill Engineering
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See my thread. Got them at Ricambi. I used 3M tape to install. They came out great and are a must have IMHO. http://www.ferrarichat.com/forum/360-430/422874-430-skid-plate-placement.html