Ok, I've looked around and understand a little more. The SCA 300 is a Metzflash and the SCA 307 adaptor allows it to attach to this range of Minoltas.

However, I would be using a Minolta flash that is already compatible with the camera so I would need a cable that is compatible at both ends. I have been unable to ascertain whether the SCA300 is compatible to mount directly on the camera.