MWSnowden

I'm so confused. I have a 2012 F150 SC 4X4 with a Rough Country 2.5" leveling kit. I want to put on Dick Cepek Gun Metal 7's 17" with 295/70/17'S but the wheels come in 2 different withes and back space. 8.5" and 9" with 5.5 and 6" back space. Does anyone out there have any experience with this combo? Thanks.