LS Series Chevrolet engines with serpentine belts typically use a reverse rotation water pump with multigroove pulleys.. These brackets are designed for a 508 style Sanden Compressor or equivilent and GM Alternators. We offer a variety of configurations such as high mounts to fit tall narrow engine compartments and low wide mounts for vehicles with low hood clearance. It is important to identify which engine the bracket is going to be installed on to make sure the belt aligns with the compressor correctly.