Abstract: A filtration assembly and method of making the same is disclosed. More specifically disclose herein are filter head and cartridge configurations which create custom-fit replacement filter assemblies, have an improved receptacle/lug configuration and are capable of being manufactured exclusively by the injection molding process. The filter head includes a plurality of engagement areas for receiving the cartridge housing lugs. A portion of each engagement area is formed by inserting downwardly projecting blades into the mold assembly which forms the filter head by injection molding.