A toner cartridge for use in an image forming device, comprising: a housing having a reservoir for containing toner therein, the housing having a front, a rear, a first side, a second side, a top and a bottom, the housing having an exit port in fluid communication with the reservoir to permit toner from the reservoir to pass out of the housing; a first leg and a second leg each projecting from the bottom of the housing and extending primarily along a front-to-rear dimension of the housing to limit the side-to-side travel of the toner cartridge during insertion into the image forming device; a first alignment wing guide positioned on a first side of the housing and a second alignment wing guide positioned on a second side of the housing substantially parallel to the first alignment wing guide, each alignment wing guide (160, 170) extending primarily along the front-rear-dimension of the housing, the first alignment wing guide includes a pair of rounded contact points (166b, 166c) and the second alignment wing guide includes a rounded contact point, the rounded contact points (166b, 166c, 176b) of the first and second alignment wing guides (160, 170) are convex to the bottom and unobstructed from the bottom, characterized by the exit port being on the front of the housing, the rounded contact points (166b, 166c, 176b) of the first and second alignment wing guides (160, 170) collectively forming three datum points defining a plane that controls the vertical position of the toner cartridge in the image forming device; and the toner cartridge further comprising a first engagement surface projecting to a topmost point of the housing near the first side of the housing and a second engagement surface projecting to the topmost point of the housing near the second side of the housing for receiving a hold down force from the image forming device, each of the first and second engagement surfaces (152, 154) including an angled front surface (152a, 154a) that faces toward the front portion of the housing and an angled rear surface (152b, 154b) that faces toward the rear portion of the housing. a housing having a reservoir for containing toner therein, the housing having a front, a rear, a first side, a second side, a top and a bottom, the housing having an exit port in fluid communication with the reservoir to permit toner from the reservoir to pass out of the housing; a first leg and a second leg each projecting from the bottom of the housing and extending primarily along a front-to-rear dimension of the housing to limit the side-to-side travel of the toner cartridge during insertion into the image forming device; a first alignment wing guide positioned on a first side of the housing and a second alignment wing guide positioned on a second side of the housing substantially parallel to the first alignment wing guide, each alignment wing guide (160, 170) extending primarily along the front-rear-dimension of the housing, the first alignment wing guide includes a pair of rounded contact points (166b, 166c) and the second alignment wing guide includes a rounded contact point, the rounded contact points (166b, 166c, 176b) of the first and second alignment wing guides (160, 170) are convex to the bottom and unobstructed from the bottom, characterized by the exit port being on the front of the housing, the rounded contact points (166b, 166c, 176b) of the first and second alignment wing guides (160, 170) collectively forming three datum points defining a plane that controls the vertical position of the toner cartridge in the image forming device; and the toner cartridge further comprising a first engagement surface projecting to a topmost point of the housing near the first side of the housing and a second engagement surface projecting to the topmost point of the housing near the second side of the housing for receiving a hold down force from the image forming device, each of the first and second engagement surfaces (152, 154) including an angled front surface (152a, 154a) that faces toward the front portion of the housing and an angled rear surface (152b, 154b) that faces toward the rear portion of the housing.