ooo, fab, thanks guys. Yes it looks like mine is a different iteration, maybe slightly newer to use the standard S3 arbs with the ping pong ball ends.
Guy, I assume that's a rebuild? Is it possible to convert to lower spherical bush rather than trunnions? Sounds a step too far for me at the moment, but interesting to note.
I've got new trunnions to fit which will have oil rather than grease in them! If it's possible to get dimensions of the oval cutout, the distance down from the top and the distance from the front that would be great.