ADD-ON KITS ONLY PROVIDE THE NECESSARY TOOLING TO CONVERT TO BIG-SERT You must have the original kit p/n 1090. What is Included: Drill, Tap, Bushing, line pin, Inserts and dowels. Second repair after a failed coil style insert. Kit includes 10 inserts of the p/n 50155  and Head alignment dowel  p/n 7588BS Qty 2