OK, here we go ... The wheels you picked are the same as factory wheels ... You can't run 35 X 12.50's on them without spacers ... Backspacing is the distance from the back edge of the wheel to the surface that mounts to the rotor/hub ... 5-3/4 BS is factory ... 5" BS is less, and the wheel sticks out 3/4" further ... 4-1/2" BS would stick out another 1/2" more ... Offset is just another way to spec a wheel ... It's how far off center the mounting surface is from center ... Factory wheels are +19mm (same as 5-3/4" BS on a 9" wheel) ... 0" offset is same as 5" BS, and -12 is same as 4-1/2" BS and sticks out the furthest in a 9" wide wheel ... And yes, my sidewall is even with the outside edge of the top of the flare ... Hope that makes sense
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