593617 goes directly on top of the remote, the spherical seat (571933) fits on top of it, followed by the cover.
That illustration shows all the parts, but they're all over the place, if you tried to assemble it all according to how it looks in that pic you'd never do it.
Think: Morcambe & Wise.
I am playing all the right notes, but not necessarily in the right order!"
Gearlever buzz is a common problem but can normally be cured if all the parts are in good condition, and correctly assembled, with a few applications of grease in the right areas.