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Middle Atlantic Products' SR-SUB Sub-Plate Mounting Kit for 89-D Type Brackets and Electrical Boxes on SR-40-22 Backpan includes all the hardware needed to mount a model SR-40-22 frame to an industry-standard 89-D wall bracket (89-D not included).
If you're using 89-D hardware to secure SR Series racks or electrical boxes to the wall, you need an SR-SUB kit designed for your model enclosure.
Mount Using Industry Standard Hardware
If you're mounting SR Series racks or electrical boxes with 89-D brackets, this adapter kit will keep them stable.