Not quite sure of it's proper name, I would call it a Panhard rod, but not sure if that's right, but it is the bar that goes from the NS body back to the bottom of the hub with the large nuts on it. The one that stops the wheel going back into the wheel arch & gives you adjustment on your castor.

On this stolen picture it's called a strut rod in the bottom left, but that's likely to be yankeedoodledandy talk



Alan...