Share 'Restoring a Mk1 Astro'

Recently rescued a Mk1 Astro that no longer has its original cable or the grey/white grommet/cable holder that feeds the cable into the base; and the round inline switch is missing too...this could have been white or grey. I'd like to restore as best I can - does anyone know where I can source these items, please? The wire is white, with R/B/G coding Thanks