This is a replacement exhaust Stud Bolt and Intake Manifold Retaining Stud Bolts is for the 4-stroke, GY6 50cc 125cc and 150cc engine. These directly replace the stock bolts and it is used on a wide variety of scooters and ATV brands and models that have Chinese built 50cc GY6 139QMB engines.

• M6  x 32mm
• M6  x 63mm