I don't usually say this, but the search feature does work. There's lots of threads about this. Search "skid" with titles only.
We have the F430 plates from Hill Engineering are listed here: http://www.ricambiamerica.com/product_info.php?products_id=261258
I have the Hill Engineering skid plates in Aluminum. I like those because they dont make noise when you scrape them. Although the silver color may not go with some colors. It works great with my Blue.