The '65-67 B-Body 8.75 is about 5/8" narrower than the '68-70 at 59.5" drum to drum. Should be about right for those wheels, I think?
An uncut explorer 8.8 is pretty close to that same width. I calculate 59.375" axle flange to axle flange, so it would depend on drum or disk for the overall width.