Factory 16.5x10 6 lug wheels? What Hubcap?

[Malibu Monte]

I am trying to purchase a set of 16.5x10" wheels with 6 bolt pattern. The seller claims that they are factory 1972 truck wheels. I have searched here and found that they were a factory option on multiple threads, but can anyone tell if this is in fact the wheel that the factory offered? Also what hubcap fits these wheels? There are no nubs and it looks like it might have had clips at one time. Is there a P03 cap with 1/2ton 4x4 hub hole available with inside clips that would fit, or some other option? I have seen many say that most people that ran these wheels "in the day" wouldn't have ran hubcaps, but I would like to. What is a fair price to pay for a set of these wheels?