Some of these bulbs can be bought online and others must be bought at the dealer.
The best sources are www.thesaabsite and www.genuinesaab.com
Here is a list of the bulb part #'s and the switch they go with:
Click on the component to jump to the replacement section.
These sections will go through how to replace the bulbs in the front of the car.
I do not go into the HID Xeon headlights since my car does not have these