The "rubber bushing" 330784 is actually a steel tube or spacer that the pictured rail has welded to it - whether you need it depends on whether you get the rail with or without the spacers welded onto it. There is no rubber "mounting" for the cab, only a rubber seal.
Can't help with the bailey channel - I just ordered some from All four x 4, telling them what it was for. But that was years ago.
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