I have a set of 1999 C5 rims I just bought but they don't have center caps. I know I can but the star shaped caps they came with. My question is can I buy a circle center cap to fill the hole and the get decorative lug nuts? If so what size cap do I need. Also has anyone done this? If so pics please. Or do I just have to get the star shaped stock ones??? Thank you in advance.