Rim / Cap Identification

I've been really digging all of the photos posted from the Roundup. I came across one in particular where the rim/cap combination really caught my eye.

Can anyone help me identify what this Impala has?

 

Chrome reverse wheel with a either a chrome bullet screwed to the cap or it may be an aftermarket bullet cap.

 

Thanks for the info Steevil. I really like how those caps look. Going to have to see if I can locate a set.