This Alternator Bracket, fits Small Block Chevy engines thru 1968 to 1975 307-400 Engines. for side mount alternator applications. Chrome; Steel; Sold Individually. Product Features:Fits 1955 to 1968 Small Block Chevy 265-350 Enginesfor Short Water Pump and Driver Side Alt. ApplicationsThis Lower Bracket Bolts to Headerfor Use with Proform #66114Chrome