I never got round to doing it on the Bus,  I have been in the Van a few months and finally ordered the part on on Tuesday.  Fitted it tonight and now can fill the water tank without stripping the bed 🙂

The downside is that the overflow pipe I just fitted comes out just to the front of the exhaust pipe.  I will have to extend the pipe and re-route it.  I don’t want to be leaving clouds of steam behind me when I brake with a full tank lol.