Hi Mike
I just got in a fan belt I ordered for my 1928 Model 65 and it looks real good. Well constructed too. You need to look up or find the size of your belt and go to the below web site. Mine was 1" by 40" but I'm sure yours is a different size. then and Now Auto.

https://www.then-now-auto.com/product-category/leather-fan-belts/

Where Are You From? Oviedo, Florida

Do You own a car built by Durant? 1928 Durant Model 65