13's were stock 14's were optional, even on the Sport coupe.
When i got my 62, she threw in all the parts he husband had accumulated & i stuck the 13's with B.P tires on just for a laugh, driving it had a mind of its own, any kind of rut or low point the tires would follow the ruts, weave for side to side, how did they drive in a straight line with those tires!
Just switching to 15;s & radials made the car feel like i re-re;d the steering parts.
Thats a Beautiful f;lane & a great buy too.
lots of info & parts over at the Fairlane Club of America too