It's possible that the "Plate & Bracket Assembly" is an earlier version of the "Plates, Mounting", since the drawings in WftW Volume 2 do not show the rectangular notch at the left hand end of the plate. (This was needed to provide clearance for the very long (wrap-around) strap used with Carrier No.25, which started at the LHS of the supply unit, went under the carrier, around the set, under the "Plates, Mounting" and mated with an adapter plate(1) fixed to the top of the supply unit.)
I think this plate may also have been used to fit the 'double-sized' Control Unit No.3 on top of the set in the Daimler Scout Car (though it's possible that a shorter plate or even a wooden block was used).
Chris.
(1) If anyone has one of the adapter plates, shaped like the profile of a house with four holes in the 'roof' part to match the ones in the top of the supply unit, and two keyhole slots to match the adjustable plate on the clamping strap, I'd be very interested. Just the measurements would do! (The plate is necessary because the keyhole slots in the supply unit - intended to fit it on top of the WS19 for Universal Carrier use - point the wrong way for Carrier No.25.)
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