Manufacturer HELLA Distance from belt pulley to alternator [mm] : 20 Fitting Depth [mm] : 14,5 Outer Diameter [mm] : 54 for manufacturer number : F551657.XX Manufacturer Restriction : Valeo Width [mm] : 52,2 Thread Size : M16x1,5 Inner Diameter [mm] : 17 Belt Pulley Ø [mm] : 50 Rotation Direction : Clockwise rotation Supplementary Article/Info 2 : with cap Number of grooves : 8 Assy./disassy. by qualified personnel required!