8 mounting holes.Avoid load peaks and vibrations in the powertrain with this Torsional Damper. It ensures your driving comfort by reducing engine vibrations. Torsinal vibrations will cause premature wear in a crankshaft. Unless rebuilt or replaced this can cause the crankshaft to develop cracks, resulting in crankshaft failure.The HF9825201 13" Torsional Damper, w/ 36 Spline Hub - New fits equipment brands such as: New Holland