These flywheels are made for setups that use standard 716 6 speed gearboxes with internal slave cyl pump-bearing units. They will work with all inline engines besides the om613/648 and all v6/v8/v12 engines besides the old gen v8 and v12 which are m116/m117/m119/m120. - 8pcs high strength flywheel bolts included - pilot bearing preinstalled - option for 240 or 260mm friction disc diammeter - option for both Cross (new 2+2) or Octagon (old) crank bolt pattern NOTE: mounting this flywheel requires the usage of an automatic starter ring gear/flex plate. It`s ment to be tightened with the longer crank bolts we supply the flywheel with like a sandwitch.