Common Shock Absorber used on 150cc and 250cc Metric Go Karts. Fits Hammerhead Go Karts, Carter Brothers Go Karts, American Sportworks Go Karts and many others. This front shock is used for nearly all 150cc and 250cc Hammerhead Karts and probalby most karts out there. This shock can also work as a heavier duty rear shock for the Mudhead or Trailmaster Mid-Size Karts. Trailmaster 150 XRX & 150 XRS (Front Shock), Trailmaster Mid XRX & Mid XRS (Rear Shock), Trailmaster 150 UTV (Front Shock), Hammerhead 150 UTV (Front Shock), Hammerhead 150cc (Front Shock), Hammerhead 250cc (Front Shock), Hammerhead Mudhead (Rear Shock). 10mm Hole, 325mm from Center to Center (approx. 12-3/4") Hammerhead Part # 6.000.325, Polaris 201023009, American Sportworks 14153 and American Sportworks 14808.