For use on 1964-1969 Small Block LA engines with cast iron water pump housings and TRW or Thompson pumps. Can be used on both A/C and non-A/C applications. Includes (3) 5/16-18 hex coni sems bolts to attach the brackets to the pump body and the “H” head bolt, conical washer, and nut used to mount the brackets to the water pump housing. Extra washer provided for use on water pump housing bolt in adjusting slot. Powder coated low gloss black for better appearance and longer life. Will NOT fit Federal pumps.