Sigh....
It looks like the turret comes pre-drilled for the U.S. aerial insulator, so you need various extra bits to fit the WS19 aerial base and variometer:
ZA.1825 Mountings, Aerial Base, No.1 (middle of bottom row).
ZA.2948 W.S. No.19, Plates, Packing (not sure what this is at the moment)
ZA.2957 W.S. No.19, Aerial Feeder No.4 (short tubular one for variometer)
ZA/USA 1051 Variometer Adapter Plate
ZA/USA 1053 Variometer Adapter Washer
This is out of a late-WW2 US Mk.2 install for M4 tank, so is probably what you need.
I think the 'Plates, Packing' is a large square washer that goes between the aerial feeder and the roof, and the "variometer adapter plate" is actually a bar with a pin and socket to transfer the locating stud on the variometer to a drilled socket in the roof, clear of the large American hole. The adapter washer is dropped in from the top and serves to centre the aerial feeder in the large hole (after which the Mounting fits over the feeder followed by the tabbed washer and the securing nut). (Do NOT overtighten the securing nut!)
It is possible that I have some/all of these bits. Finding them may be another matter.
Right now I need sleep, I'm up at Oh God o'clock to go to Beltring.
Goodnight!
Chris.
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