A filter base system may include a mounting bracket configured to be coupled to a machine, and an extension coupled to the mounting bracket. The filter base system may further include a filter assembly coupler associated with the extension. The filter assembly coupler may include an inlet passage configured to provide flow communication from the machine to the filter element, and an outlet passage configured to provide flow communication from the filter element to the machine. The filter assembly coupler may also include a receiver including a receiver passage extending transverse to longitudinal axes of the inlet and outlet passages. The filter assembly coupler may further include a base plug including a base plug body including a plug surface configured to cooperate with the filter element, such that orientation of the filter element with respect to the filter assembly coupler depends on orientation of the base plug in the receiver.