Morning guys, let me see if I can do this in words, if not, i'll revert to glorious technicolour tonight. the large bracket is stuck to the rear lip of the lens, this bracket is 4 or 5mm ally and basically has a large hole in the middle for the lamp to sit in. The smaller (back) brackets are anchored to and standing off the main bracket by about 30 to 40mm, I used four M4 thread hexagonal pillars (these are standard printed circuit board, PCB standoffs), they have a male thread on one end and a female thread on the other. On each lamp the 3 brackets act as one piece, it is rigid and no movement between them.
I made sure the aperture in the bodywork had enough clearance to allow the lens to move, allowing me to adjust the direction of the beam. The 4 main screws are quite long and have a spring sleeve, these 4 screws locate in 4 holes in the rear smell brackets, the holes in the rear brackets were widened to allow for adjustment, as the bracket may end up not sitting perpendicular to the screws, because of adjustment.
Dave P, yes the four long screws/bolts (the have the lock nuts visible) are through a flat piece of GRP, the heads are bonded to this, then this GRP is bonded to the inside of the aperture on the bodywork, so you end up with 4 studs unto which the bracket we are discussing can locate. Sorry that part had been done when I got the car, so I skipped it. My 3 daughters like all flavours of ice-cream, I have 'hundreds' of containers for screws, washers,.....
Let me know if this description is still unclear and I'll photo one tonight. K