Bolt on counterweights. Bearings included. Lip Style rear main seal.Includes: (1) Crankshaft (1) HCP85036 Rod Bearing Set (1) HCP68084 Main Bearing Set (1) HCP3113721121 Thrust Washer Set The HCPZZ90078 Crankshaft Kit fits equipment brands such as: Allis Chalmers, Massey Ferguson