A conversion unit is used for indirect attachment of a mounted implement to a working machine. The mounted implement features a single-point connector, while the conversion unit features both a multi-point mounting arrangement configured for removable coupling to a multi-point attachment arrangement on the working machine, and a single-point coupler configured for removable coupling to the single-point connector of the mounted implement. With the conversion unit in an operating position attached to the attachment arrangement of the working machine, coupling of the mounted implement to the conversion unit via engagement of the single-point coupler with the single-point connector indirectly attaches the mounted implement to the working machine in a mounted position thereon. A shared upright axis of the single-point coupler and single-point connector allows angular adjustment or free-swiveling of the implement about the shared axis when a corresponding lock pin is withdrawn from locking position that blocks such movement.
