About this item Fitment 2-9/16″ between mounting frame tower mounting tabs Fit for Small & Big block Chevy motor mounts; Great for stock and high performance engines. Wide Compatibility Fits for Corvette; for Camaro; for Trans Am; for Firebird; for Bel-Air; for Biscayne; for Impala; for Caprice; for El Camino; for Chevelle; for Nova ; for Chevy II … many different makes and models. Replaces OE Part Numbers 3990914 3960768 6258154 Premium Quality Made from Polyurethane with zinc plated steel construction, strong and sturdy; Reinforcement plates includes for extra height and strength if needed Aftermarket Service YUCHENSHLP brand is a professional auto parts seller,backed by team of engineers and quality control experts in the United States. If you have any questions, please feel free to let us help you solve them. Thanks!