They are a 15x7" wheel.I think they are 15"- I've seen a couple of Jeeps with them (96 and down, IINM), and listed on a wheel refurb site. I believe I've seen the same wheel on some DCP shortbuses and a car or two as well (makes sense if it was a dealer option).
As far as I can tell from my limited research they were only offered in the '00 model year.
I'm not sure about uses on other vehicles. I've never seen them elsewhere.