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.