Check the Ultrastang website, I believe that it's the same width as 65-66 so would be narrower, perches would need to be relocated and they have the truck wheel pattern...
It won't bolt in, yes it is same width as 65/66. The bronco rear mounts under the leaf springs. Perches are $20 at any 4x4 shop. I had my axles redrilled for $40 at a machine shop. Mine came with a 4.11 and Detroit locker out of a junk yard 66 Bronco.
Check the Ultrastang website, I believe that it's the same width as 65-66 so would be narrower, perches would need to be relocated and they have the truck wheel pattern...