Included are embodiments of a cartridge assembly for modifying a treating surface. These embodiments may include a reservoir for storing a treatment composition, where the treatment composition is being applied to the treating surface. The cartridge assembly may also include a body portion that is coupled to the reservoir and configured to engage with a cartridge housing. The body portion may include a plurality of engagement rails, including a primary engagement rail and an auxiliary engagement rail, where the auxiliary engagement rail has a shorter length than the primary engagement rail to facilitate engagement with the cartridge housing in a desired configuration.
