If you are just need to add to the coax, then any compatable version with the correct fittings could be used. Check at a local CB shop might help. Just need to match the coax version as close as you can and use the correct size male and female
Should be the BT 00147, which is 2 spereate plugs and havea potentional 6pins each but not always full with pins. If it does not work you can always return