Yes, it's wider to fit the 80 frame. Justin says 35s and 37x12" tires will tuck fully. I am one of the first 10 units, my build will start next month. We run 37" KM2's on my "donor" 1993 80 series. If you know you will be running large tires he is changing some of the rear suspension components moving the rear wheels/axle back a bit, this does 2 things:
1) makes sure it doesn't rub the front of the wheel well when fully compressed (arc of the rear lower control arm lengthened)
2) gives your rear driveshaft a slightly less steep angle (they move the tranny/engine/t-case back several inches to fit the new front end/hood, shortening the rear driveshaft)
-Hakalugi