So basically Cortina wishbones with the inboard end cut off, a plate welded on and a spherical bearing rod-end added? Bluddy he11, I thought it was some sort of black magic!
I had always got the impression that SEAC rose joints was something to do with the front drop links , so I've always thought my car was one of the SEACs without! Now I've seen what they really are from combines photo , I've discovered (3 years later!) that my car does have them .