Finally... found a photograph looking down on the rear of a T17E1.
If you have a turret with 37mm gun, the WS19 is presumably installed in the turret bustle, there's a Aerial Base No.9 (on mounting No.1) on the turret roof to the left of the set and a Base No.8 (or 10) on the roof to the right of the set.
The variometer is mounted vertically, suspended from the turret roof by what I suspect is Aerial Feeder No.4 - it looks like a thin roof - on top of which is Aerial Base No.8 Mounting No.1 and the base No.8 (or 10) is fitted to that.
Depending on the diameter of the hole in the roof you may need a centering washer and a few other bits to make it fit properly. (The Americans drilled bigger holes for their aerial bases than the British used.)
Basically it's very similar to the Sherman mounting, but the variometer was shipped without the feeder (part of the installation kit specific to the vehicle) and that may be what's confusing everything.
Does that help at all?
Chris.
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