ADD-ON KITS ONLY PROVIDE THE NECESSARY TOOLING TO CONVERT TO BIG-SERT You must have the original kit P/n J-42385-500  What is Included: Drill, Tap, Bushing, line pin, Inserts and dowels. This is a Oversized Second repair . Kit includes 10 inserts of the  p/n J-42385-507BS  and Head alignment dowel J-42385-508BS  Qty 2