This kit is an ‘add on’ for the C-AEA536 toothed belt water pump drive for the charging system.
The large alternator/dynamo pulley is driven from the water pump pulley by a separate belt, thus ensuring the vehicle is still driveable should the charging system belt fail as the water pump will still function.
Do not over tighten belt. Correct tension is when you can easily twist the belt through 90°.
Spare belt part number is C-AEA537A.