Critical NoteSome of the Older Engines May Also Require Grinding, In Order for the New Stator Ring to Fit Properly. Do NOT Grind More Than Necessary for Fit - Inspect the Stator Ring Upon Installation to Make Sure It Does Not Come in Contact With the Cylinder Casting.ConditionNewBriggs Has Superseded Some of the Older Design Rectifiers to Fit Newer Engines, BUT It May Require Some Modifications. The (4) Included Shims May Be Required to Keep the Stator Ring From Hitting the Casting of the Engine.