BRAND NEW  WIDE BELT PULLEY KIT FOR DELCO  10DN AND 10SI ALTERNATORS COMES WITH: 1 PULLEY 1 FAN 1 NUT 1 UNDER FAN SPACER Please confirm your old parts info before ordering.. We are glad to answer any questions you may have. For :  •  Delco Agricultural, Industrial, Marine Alternators Dimensions:  •  16-19mm Belt x 63mm OD x 17mm Bore Notes:  •  Conversion pulley with small OD to increase rotor rpm at slow engine speeds. Includes 84-2605 hex nut