From the Gates Site:
Fan & Alt.Automotive V-Ribbed Belt (Heavy Duty)K060672HD
Automotive V-Ribbed Belt (Standard)K060672
Fan & P.S.; W/Hyd. BrakesHigh Capacity V-Belt (Heavy-Duty)9650HD
High Capacity V-Belt (Standard)9650
Do you have the number off the old belt? You can go to these sites and cross reference. I know on my previous P30 7.4L, there were at least 2-3 different belts listed. The problem is getting correct length.