A connection box assembly includes an electrical connection box with one end shaped to receive a fastener for securing the connection box to a stud or other structural member. The other end is secured to a slide. A spacer is inserted within the slide to register the connection box with respect to any sheathing, sheetrock, or paneling material applied to a back side of the stud or other structural member. The slide engages the spacer with a uni-directional ratchet controlling the extension of the spacer from the connection box.