ok well im assuming these steel wheels dont come with center caps?

no they are extra as are the lugnuts you will need.
wich are 60* conical seat lug nuts. i got mine from summit. they are silver soft 8s wich i think were slightly more.

i paid 260 shipped for rims, chrome valve stems and center caps. that was about 11 months ago.

Would anyone happen to know what the BS on the jeep rubicon rims are?

dude just do some searching. its easy. but the backspacing is 5 inches