Xintex Conversion Plate - CMD-4 to CMD-5 - BlackConversion Plate CMD 4 to CMD 5 Black Optional conversion plate for mounting CMD 4 or CMD 5 Carbon Monoxide Alarms in places where larger CMD 3M or CMD 2M units were previously installed. This cover plate covers up unsightly wear or openings from previous installations. Four mounting screws are included. Conversion board CMD 4 to CMD 5 black optional conversion board, used to install the CMD 4 or CMD 5 carbon monoxide alarm in the place of the larger