mac here, also measure / bring along the old belt and see what's up with the " end of the adjustment deal" ,do get preferably an OEM and if for some unexplainable-weird reason
it truly needs to be "smaller" GET a SMALLER belt because a replacementpump (may have been installed ), which may be fine, probably has a smaller diameter PULLEY !
So ,in that case you gotta try - should work - the correct "New" ,but smaller
size ? Don.'t forget to "brakleen" wipe all the associated pulley "grooves" . Glen 11/18/2017