Mounting instructions for the Red 1/2-width Golden Age Project products: The left side of the left unit and the right side of the right unit are mounted with two screws to the sides of the UNITE MKII. Then attach the supplied metal parts on the other sides of the unit´s (the sides facing the middle of the UNITE MKII) with two screws. These two parts are then fixed to the bottom of the UNITE MKII with two screws. As a final step, mount the long, thin mental part in the middle of the unit to fill up the gap in the middle between the two units. Mounting instructions for the Red and Black 1/4-width Golden Age Project products: There are two threaded holes in the bottom of the box and matching holes in the UNITE MKII. Use two screws to mount each unit in the UNITE MKII. Up to four units can be mounted in the UNITE MKII. It´s also possible to mount two 1/4-width units and one 1/2-width product. Mounting instructions for the ½-width Golden Age Premier products: There are two threaded holes in the bottom of the box and matching holes in the UNITE MKII. Use two screws to mount each unit in the UNITE MKII. It´s also possible to mount two 1/4-width units and one 1/2-width product.