I just found a site called "Then and Now Auto" which lists a number of fan belts for our cars. I purchased a 1" x 40" size for my Model 65 and it came in. Looks good and is stitched well to join it. Doesn't use metal stitches though, but does look strong enough. Fast shipping too.

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