We stock factory GM pump pulleys. Our GM Power Steering Pump Pulley has 2 grooves and is the bolt on Saginaw type. This popular pulley is used in most power steering conversions using a Chevy engine. This particular pulley works well for both 350 small block and big block applications due to the 2 groove design! For use with bolt on power steering pump shafts. Works on many types of GM engines including Pontiac, Buick, Olds and Cadillac Limited Lifetime Warranty.