Here's what I did: (non S-line, Non-S3, regular US-spec A3...)
Drilled a closely-spaced diagonal set of 5mm holes:
Same thing, but backlit:
Made some 0.1" pitch circuit boards to stuff behind there:
Here's one inserted through the carefully-drilled holes into the fog grille, with the others close by:
Here's two loaded in, one either side of the center 'rib':
rear view of the LED clusters wired through current-limiting resistors:
Test-lit using a DC bench supply:
Two of them test-lit:
Lights out... it's pretty damn bright!!!:
Here's the two foglights side-by-side, unlit:
...And I experimented with some film-set lighting gel (
www.leefilters.com) to correct the light from "blue-white" to PURE white (seen to the left in this photo:
..then of course, I got a bit giddy, and added two half-rows (one above, one below) to each fog grille, with super-bright
AMBER LEDs, to use as turn-signal repeaters:
I've still got to install them, but they shoudl look pretty 'stealth'. -They're actually mainly 'hidden' by the 'ribs' above them, but they should light up pretty well once they're on there.
Keith
not even "finished" flung together either...the seller states they are "almost finished" and still need to be glued together or similar 
