FUSION SM-X65SP2B SM Series Three Surface Corner Spacer - BlackSM X65SP2B SM Series Three Surface Corner Spacer Black The SM Series has two optional accessory mounting spacers to support installations in various positions for a professional install. The SM X65SP3B is designed for mounting the SM Series speaker onto three surfaces all perpendicular to each other, for example a corner where the ceiling and two walls meet. Available in Black or White to match the color of your SM Series speaker for a seamless