Yeah, they do, but that's another reason why I want to convert this car from a 6 to an 8, or else go to a 14" wheel with 4 lugs, which I would prefer not to do. The largest I have managed to find thus far is 185 80 13.Do they still make 13 inch tires?
Thanks for your advice and the reference--- I can take it from here.The factory 14" rims ran a 78 series tire. The diameter of the base wheel/tire was around 26", maybe a little taller. I ran 195/70 and 205/70 size tires on my '66. Your wheels are only 5" wide. Contact Mustangs Plus mustangsplus.com. They are very knowledgable about tire sizes and fitment. They also have a restoration/tech book that tells the proper diameter for your car and how to buy todays tires to fit any rim size you might want to put on your car. If you want, I can look for my copy after work.