What do belt part numbers mean?

Check out this quick video on how to decipher alternator belt part numbers, and make it easier to find a replacement belt. All Sprinters use a 6 rib belt. Some are metric length, some are imperial length, some have both length units on them. When you go to a parts store, it is often easiest to just look at the belt stock they have yourself, if they will allow you, as many parts counter clerks do not understand belt sizing and unless there's an EXACT cross reference to what you are asking for, they may not find one that is equivalent.