Ok so I'm sure we have all seen the MazdaSpeed rims that anyone can buy for their cars on the Mazda web page. My question has to do with the center caps that go along with these rims. Does anyone know the dimensions of these center caps? Will these fit on our stock rims? Or maybe another set of rims? I think these would look really good on our cars, but don't really want to spend that kind of money on a new set of rims right now.