Toyota Rav 4 Witter Tow Bar Parts - Long Shot

Hi. I have a Toyota Rav 4 2003 LWB 5 Dr with no step.

Attached to it is the fixed part of a Witter Stowbar TY123AR.

Unfortunately the removable bit with the neck and ball was not passed on to me when I bought the car.

As I say, I know it's a long shot but does anyone know of anyone who has these parts without me buying the whole new tow bar. Witter won't sell just the removable part.

I have twin electrics too.

Pleeeaaaasssseee???