Manufacturer HELLA Distance from belt pulley to alternator [mm] : 8 Fitting Depth [mm] : 12,3 Outer Diameter [mm] : 54 for manufacturer number : F-238120.XX Width [mm] : 34,2 Manufacturer Restriction : Bosch Thread Size : M16x1,5 Inner Diameter [mm] : 17 Belt Pulley Ø [mm] : 49 Rotation Direction : Clockwise rotation Supplementary Article/Info 2 : with cap Number of grooves : 6 Assy./disassy. by qualified personnel required!