That link is not my post. I do have the above mentioned clip-on device, but mine is for the meter knob. I'm not sure where it is as I don't use it much. I do have the 38-60mm B60 hood, and it clips to that just fine.
The picture linked shows the cold show lens shade attachment (which you linked above) attached to a B60 38-60mm hood, on an SWC, with the meter (Voightlander VC II) attached on the side so the finder is clear - I think this is what you inquired about?