Swivel Pins and Railko Bushes

[Jojo]

G'day all and my warmest greetings to you mates Down Under!
Now, another problem is menacing me:
My 110 has the Swivel Pin Bearing Houses (Chrome Balls) damaged. As I have a spare pair in my shed I was going to fit them ...until I realised the 110 has a so-called Railko Bush as bearing for the top pin and the spare parts I have (from a Disco) have the common roller-type bearings at the same place. Now that's where my question comes in:
can I take out (somehow) the Railko Bush and fit it onto the other chrome ball? If yes, how to do it successfully? Can I obtain the plastic part of a Railko Bush as a spare? (Here I have to admit that I damaged it due to my own stupidity whilst attempting to remove the assembly).
or is it possible to simply transfer the roller type bearing to the 110 and use them instead?

Any advice needed! Thanks, mates!
Cheers

[JDNSW]

Later Defender 110s have the roller bearings top and bottom, but I am not sure if there are any other differences. The composition railko bush is available as a spare.

[Jojo]

Thanks for the answer! Any idea how to remove the Railko-bush's sleeve without inflicting too much damage? I am somewhat stuck, I have to admit!

Cheers

[JDNSW]

Manual says to use a press. I have not done it on a 110, but that is how I would do it.