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Has anybody tried to install the Hella 550 fog lights in place of the stock GM parking lamps? Of course, I'd have to switch the connectors to power up the Hella H3 Halogen bulbs (and I would install a relay to power them directly from the battery with heavier wiring, like the headlamps). The Hella 550 lenses are glass and they measure 195mm x 96mm... they look like an ideal fit (on paper). Just pull out the headlamp switch to the first "detent" and there you go, fog lights. Plus, I believe that you'd have much brighter turn signals (don't know if it would cause problems with the flasher).
Think I'd probably drop down to a 35W halogen H4 bulb from the typical 55W bulb too. Prolong the life of the bulb, reduce the draw on the electrical system a little, and it would run just a little cooler inside the housing.
As far as I can tell, the Auxbeam product that you directed me to doesn't talk about DOT approval or legality. You can't have it both ways, commenting on the legality of fog lights and then ignoring the legality of a particular LED headlight product.