Good news.
I took apart spare switches for you today.
Fog light switch. You don't have to take them apart to get the bulbs out, I just wanted to see how these things worked.
These bulbs twist lock into the side of the switch.
You use a screwdriver to undo them, then figure out a way to pry them out (I used extra lock wire)
The heated seat switches look like that. There is a tall bulb and a short one. You undo the switch at the bottom and slide the assembly out.
The light bulb assembly just slides off.
Now as for replacing them, there is a part # you can get at radioshack. I found it on SLi-net, but cannot for the life of me find the damn thread. You have actually have to remove the bulb and little leads and put a new one.
I am not doing that. I plan to just rib out all the bulbs out of switches I find, then test them with my jump pack and put good ones in my car. Someone smart may know of an LED replacement or something, but I don't like spending money on my boring DD.