The swivel housings are the same.
You can fit splined cones, Railco bushes or tapered roller bearings to all of them.
I bought new Britpart a few years ago and they seem OK.
Splined cones I would not bother with as the splines wear and I dont think new ones are available.
I am building up one with bearings top and bottom using a bottom arm on the top cutting off the arm. Should be like a disco as long as the preload is correct. Some have tried this and report bad wheel wobble or shimmy.
Probably you are best to stick to Railcos as parts are readily available.
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