I had the same wheels and tires on with an 11.75" setup but I had to use a 5 or 10mm spacer (I can't remember honestly) so the wheels wouldn't hit the hotchkis control arms at full droop with the wheels turned. With the Dr Diff 13", everything clears, but let's be honest it's still not a lot of space.
Fresh picture from the garage today. Closest point is about a 1/2" clearance or so. Not a chance on a 17" wheel.
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