This part replaces the stock bed support bracket on the end of the bed support arm. To complete this build, you will also need a 6 inch length of 3/4" wide by 1/8" thick aluminum angle extrusion, some nuts and bolts, washers and lock washers and a drill. The extrusion and fittings are available at any home improvement store. Other than that, this bracket is designed to work with the stock MakiBox screws that mount the original bracket.
Basically, this part rides along the aluminum extrusion which is mounted to the wall of the printer. This prevents any wobble in the Z axis. Check out the photos of the mod that I included above for more information.
I designed the part to have really tight tolerances so depending on how screwy your printer is, you may have to file the channel in the bracket down to accommodate the aluminum angle.