OK, I'll take that cookie now.
The two channel sections on the left of the photograph are "risers" for Carrier No.1 (or No.2, but more likely No.1) used in a tank installation to raise the the set above the shelf it would otherwise have to sit on. (See standard Sherman installation, etc.)
The three fittings on the right, with "Barry" mounts are for wireless trucks to prevent sudden stops (etc.) from destroying the carrier shock mounts. (The Carrier, usually No.3 (or 23), or 25 is fitted to the operator's table behind the cab, in a couple of removable clips. The plate with 6 holes is screwed to the WS19 set top (6x 2BA screws), and the Barry mount to the wall of the Wireless Body. The wing/butterfly nuts allow for variations in the spacing of the set carrier from the wall of the wireless body (and can be unscrewed when you need to remove the entire set on its carrier). (May also have been used in other vehicles (tanks?) if they were having trouble with the set moving under acceleration/braking and damaging the carrier shock mounts, but I've not seen it in any docs.)
I have a different version, with a slotted plate for the set top and a "Bridge type" shock absorber on a metal plate, with a backing plate for bolting through the wooden wireless body.
Chocolate chip cookie if you've got any.
Chris.