[Chris Suslowicz]

Hmmm...

There's also a "Carrier, Set, No.84" but that has a later VAOS number - up in the 40,000s, which has a plain, undrilled top. (Bear in mind these will be draughtsman's impressions from the (presumably) original drawings and may bear little resemblance to what was eventually issued for service.)

The hole patterns in the top deck of the '73 bear little resemblance to anything sensible - I suspect it's an "artist's impression" of the earlier top plate, with no measurements, as that would allow LH or RH fits for Variometer, Aerial Base, and Control Unit, plus (possibly) other stuff.

In the drawing, the three holes for the variometer are much too close to the LH edge of the top plate, and the Aerial Base No.8 or 10 should be in the middle, with a Control Unit No.2 to the right of that. (The arrangement can be 'flipped' for a "Right Hand Side" setup, where you have two sets in the back of a vehicle.)

The Facebook photograph is of a "barefoot" WS19 since it has the standard variometer rather than the Tuning Inductance - and you'll let the Magic Smoke out if you try a variometer with the RF Amplifier No.2!

Best regards,
Chris.