WIDE UNIT SHELF SYS 17.5DP Accommodating components too wide to fit the 17-3/8 inside width of standard rackshelves, these shelf systems fit units up to 22-1/2 wide, and either bolt into millwork or to the mounting angle of standard rackrail. Measuring 5-1/4 high, this shelf saves room by requiring no rackspaces. The WUSS system comes complete with a pair of ears, a bottom, and appropriate assembly hardware. NOTE: This rackshelf works with all Middle Atlantic Products enclosures with the exception of enclosures that use Z-Rail.