Original Wheel and Tyre size Duster?

volaredon said
My dad's old 76 feather duster. (not a v8 car) was 13s, something like 6.95x13 on the door sticker

Woah, are you sure? According to the 1976 Plymouth Duster dealership data book, smallest rim available in ’76 was 14inch.

https://www.hamtramck-historical.co...rshipDataBook/1976/76-Valiant-Duster_0008.jpg