Here's a site that's pretty good if you're looking for an oddball wheel or cap. They're all call for prices, but almost all have pictures. They also have vintage caps.
http://www.akhwheels.com/
Bryan-NW 'burbs1972 MalibuVaguely stock appearing, and the opposite of restored.1999 std bore 5.7, Vortec heads, Holley Stealth Ram, GM cam700R4, Viking coilovers, 12 bolt 4.10 posi, and a whole bunch more