I have a friend of mine looking for a set of rear quarter weatherstripping for a 60 Valiant wagon. Not sure if it's the same.
Can you add a picture how it looks off the car?
The part number of the weatherstrip 2255 726 (R) and 2255727 (L). If you know (or can find out) the part number of 60's weatherstrip, it could be determined if they are the same. They could be since the number is pretty low - 2255.