Belunt, as I know absolutely nothing about bass knobs and which one would go with your amp I haven't a clue whether or not this one is what you're looking for but I acquired a bulk lot of stuff from a friend the other day and seeing your thread made me remember that this was in it:
The entire cable is there and both plugs on each end are intact.
Let me know (if you're interested) if this is the one you're looking for. I do not have the mount for it ~ only what is shown in the pic...the control itself and the connection cable.
Thanks for the outpooring of support you handsom devils. Yeah prowler the first one pictured is for newer style amp but keep me posted if you track one down, Camry you got PM.