Google found it for me "Heim joints" (UK). (Rose Joint in the US)
Yep.
I'm at work now but I'm keen to pull the old ones apart and see what's in the centre of them.
It appears the Hiem Joints are pretty ridgid. There maybe a very small amount of movement between the ball and socket but only very minimal. All the shock absortion of movement will be in the poly bushes in the Watts to Chassis mounts. I can't see this being a problem at all.
Happy Days.

