need some wheel fitment help

I am planning on a full disc brake conversion on my demon, so I am also looking at a new set of wheels because of the switch from sbp to lbp. I'm looking at 17x7 4" backspacing 0 offset and 18x9 5.94" backspacing +24 offset. will these fit, i do have other options with the backspacing but i like the staggered look and a nice fat lip on the rear.
my other backspacing option is 18x9 6.38" +35. leaf springs are stock and its a 8 3/4 rear.

any recommended tire sizes? i want the rear side wall to be the same if not a little bigger than the fronts