Note: Does not suit new Cinema Series Models Model Suitability: M4RU30 - SR5015, SR6015 Marantz Custom Installation rack-ear mount kits are designed to allow easy and secure mounting of all 2020-21 Marantz AV Receivers, Pre-Amplifiers and selected Power Amplifiers into standard-width custom-installation AV racks. There are three models available to match ten 2020-21 released AV components – however, many superseded models may also be compatible*. Made of 1.55mm thick ZINCANNEAL® (a zinc/iron alloy-coated forming steel made in Australia by BlueScope) and powder-coated black, each kit includes a spacer to complete a tidy and professional finish, plus six earmounting screws & washers (when needed) to replace the factory-installed lid screws. *Previous model compatibility is not guaranteed; measure kit suitability beforehand