ACDelco Harmonic Balancer - 55565300 Part #: 55565300 Line: ACD ACDelco Harmonic Balancer 1 Year Limited Warranty Material: Steel Overall Width (in): 2 Inch Overall Width (mm): 51mm Belt Type: Serpentine Pulley Diameter (in): 5-5/8 Inch Pulley Diameter (mm): 143mm Balancer Style: Friction Inside Diameter Bore Size (in): 1 Inch Inside Diameter Bore Size (mm): 26mm Show More Show Less