Monoprice 106032 Installation Kit for a Pair of 6-1/2-Inch In-Ceiling Speakers Drop ceiling speaker brackets for in-ceiling installation in commercial facilities with paneled ceilings For use with product ID 4103 (Cut-Out Dimension: 8.07 | Overall Dimension: 9.4 | Mounting Depth 2.8) and 4619 (Cut-Out Dimension: 8.01 | Overall Dimension: 9.4 | Mounting Depth 4.8) This product is not compatible with product ID 6034 (MST-6F-A)