For use on most pre-1969 Big Block engines without Air Conditioning. Also used on 1966 426 hemi applications. To correctly use these brackets, the TRW pump must have a pump reservoir body to rear pulley face distance of 1 3/4″. Includes (3) 5/16-18 hex coni sems fasteners for mounting the pump to the brackets and the bolt to mount the assembly to the water pump housing. The washer is provided for use on water pump housing bolt in adjusting slot. Powder coated low gloss black for better appearance and longer life. Will NOT work on Federal power steering pumps.