There is actually a Volvo part number for the base and lamp, which I accidentally ran across. Volvo part # is 9148908. They can be found on-line for about $2.00 each, or at the dealer for about $5.00.

Thanks for the GREAT information. I did this yesterday, and it was pretty painless...hardest part was seeing those tiny wires! My only issue is the bulb bases: I'm guessing because of the heat over the years, they are brittle. One of them broke such that it cannot be twisted back into the slot and s...