I think you need "Aerial Feeder No.9" rather than "Leads, Aerial, C6" because the C6 is intended to connect the telescopic mast to the roof insulator when the mast is mounted on the vehicle roof. It's far too short to reach from the set to the underside of the aerial base. (They're very similar: a plated brass plug to mimic the base of the bottom 'F' aerial rod, and a length of insulated wire (British ones use P11 cable) to a ring terminal. The plug goes into the aerial base behind the variometer (I'm assuming this is the demountable station on Carrier No.3 or 23) and into the bottom of the aerial base.
The pigtail is intended to be an easily (and cheaply) replaceable link between the aerial connection plate and the aerial socket on the base, to allow for flexing of the rubber base and consequent metal fatigue of the connection - you can replace the pigtail rather than the aerial feeder (likewise if the base is damaged by impact with tree branches or gunfire).
You will need a rubber or cork gasket between the connection plate and the aerial roof mounting to keep rainwater out of the vehicle - the spacer (Aerial Base No.8 Mounting No.3) has been made from many things over the years: plywood with cork gaskets glued on, moulded rubber, and the post-WW2 pair of steel dishes seam-welded together (issued with a pair of rubber gaskets).
The sponge rubber sleeve is to protect the feeder from damage if it rubs against the metal parts of the vehicle. (I bought some circular cross-section rubber insulation and a set of cork-borers for making the central hole.)
Best regards,
Chris.
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