Identifying my swivel house

Sooo got some speculation about what I’ve got on my 90’… it’s Land Rover 90 with the whole drive line from a disco 1… the axle code is not visible.
I’ve got at leaking swivel, and I tried to replace the oil seal with no luck
I saw that the retaining ring could identify whether you need a railko or the newer bearing set… but I got nothing to back it up…
I want to change the swivel ball, as the surface is no longer smooth
What’s your thoughts?

Sooo Do you know for sure you have Disco front axle?
I would not go on the retaining rig as one never knows what has been done in the past.
Swivel ball looks pretty good so thinking that something to do with the setup and or seal is wrong given the amount of oil/grease coming out.
If you had taken the swivel housing apart you would know if it was bearing or Railko bush at top position [ all are bearing in lower position] A good clean up on the axle near the breather may find the number.