The MX300 NAV/COMM is designed to replace the Cessna ARC RT300/500 series. In most installations the MX300 will directly replace the RT308C, RT328T, RT328A, RT528E, RT508D, RT508A, as well as the Narco MK12D. The MX300 is available with either tan or black faceplate. See the owner’s manual for detailed specifications.