Not sure about the rear ends

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The only difference (outside) with the rear-ends is where the axel seats are welded on...

Does anyone here know where I can get some (cheap) axel seats - that are not welded onto the casing? I see a conversion kit in one of the catalogs, but it comes with a torsion bar, and I think something else besides just the seats. Those are all I really need to make it work, just clamp it down on those.