A wire harness assembly system is disclosed. The wire harness assembly system includes a locking mount for receiving a wire routing accessory. The locking mount includes a main body with an upper portion, a base flange, and a lower portion. The lower portion includes a locating shaft extending from the base flange. The locating shaft has keyed members positioned opposite each other. The locating shaft and the keyed members of the locking mount are positioned in keyed holes in a grid tile. The locking mount is rotated to a locked position in the grid tile to secure the locking mount and the wire routing accessory mounted thereto.