Whatever the fixing plate is its critical that you get it as the front bezel clips to it as well (I am 99% sure).
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Maybe the plate appears on the parts listing view of the fog light itself?
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Kind regards from Fred.
. 2010GS Auto ex Celeb, Santorini Black, 2011 facelift , spoiler, spats, mudflaps, LED footwell lamps, Witter detach,
Other cars:-
1958 & 1959 Austin J40 Pedal Cars under restoration (I make many J40 parts)
If you have an Austin J40 or Pathfinder Pedal Car looking for a new home pls PM me.
2009 Meriva

This is the fog lamp bezel - you can see that it's fixing points seem to be a top and bottom tongue.



I think (hope) that those tongues fit into the wider slots seen top and bottom here - hopefully that's the only purpose of that extrusion.

Click image to enlarge

I have been getting the images from: http://lrparts.net.ru
This is the fog light, there is only one so it must be universal and doesn't show the bit you are after.

Thanks both. I spent some time scouring that site last night. Just hoping that someone knows what the fog housing on a facelift bumper looks like

So I spoke with a mechanic at my local LR dealer - he says that the Foglight housings are the same between bumpers and that mine should simply fit over the extrusions on the facelift bumper. The extrusions are simply to take the newer style bezels. The housings will have to plastic-welded (ideally) or stuck on (sikaflex) though. Phew.