Well, I installed the H9 bulbs in the fogs yesterday, and it was an easy task. Using the following photos I found online:
The bulbs I used were Halo Automotive Solaris Yellow H9 bulbs (3000K), and I did trim off the plastic tab in the socket of the bulb (using a X-acto knife), but I didn't have to cut down the metal tab to fit it into the fog lense, I simply inserted the larger tab first and twisted to bulb until the smaller tabs clicked into the housing, then I simply twisted the bulb into the locked position.
Here's the "before" pic, with the OEM fogs on with the HID headlights (yuck!):
A pic with the passenger's side swapped out (you can already see how much brighter the H9 bulb is):
And after the driver-side bulb was swapped:
A few more "after" photos:
Not only is there a proper yellow color to the fogs now, but they are indeed brighter on the road at night. I haven't driven in any rainy or foggy weather yet, but I can see the yellow on the pavement in front of me, and they don't seem to be distracting to other drivers. In fact, I followed a friend of mine heading back to my home last night, and he had no problems with glare in the rear-view mirrors, nor by looking at the front of my car.
It ended up being an easier swap than I thought, and the benefits are well worth it IMO.