A variable width shelf assembly includes a shelf panel with first and second support brackets. One or more support slots and one or more relief slots are disposed on an upright portion of the support brackets. One or more coupling tabs are disposed adjacent to one of the one or more support slots and one of the one or more relief slots. The coupling tabs are flexible tabs configured to flex outwardly relative to the upright portion of the support brackets for coupling the first and second brackets to a refrigerator compartment. Mounting plates mounted on a refrigerator include mounting features that are received in the support slots of the support brackets. Abutment guides on the mounting plates are used to guide a bending motion of the coupling tabs in assembly.