L29 350 rocker return spring & parts needed

[cd]

Hi all

On my BSA L29 350 OHV engine I need the
  valve rocker return springs                      24-470
  valve rocker return spring adjuster            24-580
  valve rocker return spring adjuster cap      24-575
  valve rocker return spring adjuster nut      24-585

Anyone able to help me out?
Or anyone able to give me a drawing of the parts?

Thanks
Craig