https://www.spectrumcomms.co.uk/CB_Kits.htm Scroll to the FMD455 FREQUENCY MOD-DEMOD. I've bought two of these, since I have enough CB's as it is, I don't need to shell-out a C-Note for a newer AM / FM CB. So, here's how you could roll your own. You tap the 455Khz IF on the Receive side. On Transmit, tap the 10.240MHz master crystal, on the vari-CAP. BTW, how I came upon this is searching for a replacement VCO board to recondition an RCA SSB Co-Pilot #14T302 CB, and this place had that. So, if you don't want to sell-out money for a newer CB, with FM, this can be a way to go, kit-wise.