I have a 1953 Morgan sports car. I did a custom generator to alternator conversion for dependability. I could not find the required 20mm belt to fit it. Vbeltguys had a 19mm belt, but it was impossible to tell which one would fit because it would ride lower in the V-pulley. Because of their favorable pricing, I was able to order 4 belts in 1' increments until I found the optimal one. I plan to post their info on my car forums. Thank you V-belt Guys! I have a photo of the car but couldn't find a way to attach it to this review.