Yes I just checked and most are 26.8 diameter. So whats the answer from those who have already tried all the combinations? What looks the best and functions without problems like I said want to keep the same sizes front and rear on Rally II wheels 15x7. Assuming the original cars ran14 inch wheels,this car had the optional front disc brakes, and am I correct in thinking that the 15x7 will clear the calibers[i][. Thanks again to those who have responded.
I'm moving up to 265/40r18s in the rear which are 26.3. Was told by the guys at Speedtech that's about the max for my 69. Was told that 275 should fit but decided not worth pushing the limit. 215/65r15 is 26", that's a good size already.