ok i really need to get this stright i have a 04 xlt 4x4 with 3 inch body lift
right now it has 265 75 16 that 16 means and 16 ich wheel right ? i want some 33 10 50s bfg at can i get a 15x8 rim or dose it have to be 16 by what ? for the tire not to stick pass tha flares

 

as long as your getting new tires, you can get what ever size wheel you want.. it doesnt have to be a 16, just make sure the last number is a '15'

when it comes to back spacing and widths as to keep them in the fender... 15x8s will do a better job, and actually will be the only size that you can use, unless you find some 15x7's you cant use a 15x10 because you will pop a bead way to easily

...then it will come down to your back spacing, i have 15x8 with like 3.3xx back spacing and a 35x1250 tire that sticks out quite a bit..

im sure someone will jump in and tell you the back spacing you need to keep it in.. if not 'bump' it tomorrow or the next day