A 7.75-14 is more or less between a P205/75R14 and a P215/75R14. Coker tires website has lots of useful information on converting from bias to radial. Personally, I like the flexibility of the 71 GS wheels on the car. you can use 205/75R15, 215/65R15 all around. You can also use 235/60R15, 245/60r15, 255/60R15 and 275/50R15 on the rear if you want that late 60's look. With the 65 fat-bird red center caps and the argent grey paint in place of the black they almost look like they belong on the car. Coker does have the 7.75-14 US Royal tires with the 7/8" white wall too the last time I checked.