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Meziere #WP113U Water Pump Backing Plate, Billet Aluminum, Polished, Ford, Small Block, 289/302/351W, Each. Description:This plate is often used when converting to an electric water pump. Many of the Meziere pump designs are not able to completely enclose the original water chamber in the cast aluminum timing covers such as are found in the small block Ford application. Use this back plate to seal up the timing cover and successfully complete your water pump installation.Notes: For use with Meziere water pumps only.