Alex,
The lamps were stored on the front r.h. side of the body inboard of the POW frame (in the picture you can see the box), and unfortunately Rory has got as much of an idea of what they look like as I have. The only mention I have found of them is in a VAOS catalogue (section LV6 - MT3 Part 1, bulbs, glasses, horns, lamps, masks, headlamps, mirrors and windscreen wipers - Chilwell 1943 pub. N° 79/3).
Of course, obviously there is no illustration (

), but the assembly is made up of the following:
Centre (three light)
Clips, brass, securing wire guard
Guard, wire 16" dia.
Shade, 16" I.D.
If anybody has any of these to see (or even better for sale) I would be beyond interested!!!!
Cheers,
Stef