Looking for Cable 755002C0500 used with the GRC-213 when the PRC-104 is a B unit. This is a "Y" cable that provides an AUDIO jack after the other two connections have been made to the AM-7152 and RT-1209, thus not using up an AUDIO connector on the radio. *Picture at: http://tinyurl.com/mabvvju *Joseph Pinner KC5IJD / NNN0PHR* *