The SBX-IXGDM7 is the surface mounting box used to mount the IXG-DM7-HID. The box has a 1-gang and 2-gang mounting hole pattern in the back and 1 conduit knockout in bottom.
The box dimensions are (HxWxD) 13-3/4" x 7-5/16" x 3-1/16"; 349mm x 186mm x 78mm.