I believe the original tire was an 8.00 x 14. They didn't list aspect ratio then, but most were 78.
Have no idea which white wall you need. Bet someone at PY could help out.
Here is a link for the only one that popped up on that size. Don't know if this wide white is correct though:
https://www.cokertire.com/tires/800-...wall-tire.html
Rusty Small can probably help you get what you need. Screen name is SmallHurst.