Includes Free Shipping. TIME-SERT 1/2-13 Subaru Conversion kit, for special high horse power application, which converts original M11x1.25 to a larger Outside Diameter of 1/2-13. *Note if working on a Subaru for non racing application using OE M11x1.25 see Time Sert 11125 Kit. Replacement inserts for 15100 kit is 15105 which measure 1/2-13x1.180.