Can someone tell me the name of these American Racing rims (click the following link)?

http://www.countryclassiccars.com/8031_2.jpg

i just get these 15″ american racing rims but 2 of them are missing the caps. i have looked everywherefor one.?

help help they are nice rims.. with the caps. i just need to find them,
the caps only have one screw part and it covers the nuts. is there any sites that sell these? help please.