They're halogen bulbs, type H7. At AutoZone, I get the "Sylvania Basic" version. Just get the cheapest H7 and it'll be fine. There's all sorts of upgraded bulbs available.
SaabCentral forum the most comprehensive Saab resource on the internet. Join our discussions on the Saab 9-3, Saab 9-5, Saab 900, Saab 9000 and all other Saab models, choose your forum.