CVF Racing V pulleys needed hose and belts?

I don’t know the size, I do know how to decode the belt number. Dayco numbers are like 15450, the 15 is the width of the belt, the 450 is the belt is 45” long. Some companies reverse the numbers and it would be 45015. You can mount the pulleys and put the alt in almost full loose spot and take a rope around the pulleys It is probably a 15 wide. Then search online by the number. Say your string is 48” search 15480. Also if you need 48.5” the number would be 15485