I have 73 up spindles and 11 3/4" B rotors. The rims are 17"X9". I never measured the backspace. The tires are 245/45/17. I don't have any spacers. Everything clears. The O.P. has a later car.
The hub center on the ford wheels is too small for the larger mopar rotors on the front of my car. Had to enlarge the hole to get it to seat on the 11 3/4" rotor.
I used a wider (ford 8.8 rear and mustang "bullitt" rims with lots of backspace (4.5"?). I mocked everything together and measured ..alot! Now my 65 is 4 wheel disc, 17" 5 x 4.5 rims, 3.73:1 l.s. diff. The 8.8 is full width from an explorer.
11 3/4 rotors front, explorer 8.8 disc rear, full width. I hogged out the front rims with a hole saw, turned the O.D. of the rotor hub down about .1250 with a drum lathe.
8.8 explorer rear, full width w/new spring perches. 11 3/4" B rotors, 73 up UCA's and spindles, stock 65 tie rods. Turned down the O.D. on the rotor hub by about .1250 and hogged out the rim center with a hole saw.
Look at a wheel web site, like tire rack.com, what do the wheel makers say? They have major liablity on fitment and safety. I personally have no first hand knowlege, but I don't take chances :read2:with wheels, tires, or brakes.