I rec'd a Pelican email from Andy (email address given didn't work, so responding here) regarding the wheels and tires on my Sahara Beige 77 turbo-look.
The wheels were modified by Weidman's Wheels to be 8.5 x 15 Front, 9.5 x 16 rear. Tires are Bridgestone RE 71 225/50 and 245/45.