72bluNblu said

Wheels with that much offset are common in 17"+ diameters. In fact, wheels with that much offset are the norm with 17"+ wheels.

My rims are off the shelf, nothing custom about them. Enkei RPF1's. The rears are 18x10 with a +38 offset (7" backspace). I run 295/35/18 tires on them.

As for the front, once you go up to a 17" rim you can run as much as 5.7" of backspace on an 8" wide rim before you start to run into outer tie rod end clearance issues. I've seen a 17x9 with 6" of backspace on the front, but that would be specific to the design of the rim, most of the Mustang Bullit rims start to hit at 5.7".

If you go to 18" rims in the front, you can run even more. 18" rims can fit the outer tie rod inside the diameter of the rim, so, your only limit is the frame. My front rims are also Enkei RPF1's, 18x9" with a 35mm offset. That's a 6.4" backspace. Now, that isn't the whole story, I also have Dr. Diff 13" rotors which widen the track with 3/16", and I run a 3mm spacer. So, my effective offset is 27mm. But I also run a 275/35/18 up front. With a narrower tire you wouldn't need the spacer, and that amount of offset would be fine.

Honestly, the 65-67 B-rear is perfect for the Dusters/Demons/Dart Sports if you're going to run 17+ rims. It makes the backspace needed the same front and back, so you can rotate tires. The 68-70 B rear is a little wider, which is why my offsets are at 38mm in the back and 27mm in the front. The 65-67 B rear would even them up the offsets needed.

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