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
R.I.P. Dirty Debby. I miss that truck
New truck sports a chrome "C" on the fenders.
"Matt's the devil on your right shoulder, and you SHOULD listen to him... And take pictures of the carnage!!!" -stRanger