Instock. The Short Head Course bowl liner kit is designed to have everything you must have when replacing the bowl liner on your HP400. The kit includes wedges (6), shims (6), square head bolts (6), spherical nuts (6), lock plates (6), bolt stops (6), felt strips (6), Mellott Company Standard Backing Compound (3), and a Short Head Course Bowl Liner XT71018% Manganese Content (1).