Gary Tayman specializes in FMR-1 Stereo Conversions for these old radios of ours. Here is his contact information.
http://www.garytayman.com/
caradio@verizon.net
Phone #: 941-371-8924 (8:30-5 M-F)
http://www.garytayman.com/
caradio@verizon.net
Phone #: 941-371-8924 (8:30-5 M-F)