I replaced the stock bulbs in my 1999 M Roadster with Philips Bluevision and Allweather bulbs. The entire process took about 15 minutes.
The part numbers are:
Philips 9006 55W Bluevision (low beam) $34.95 per pair
Philips 9005 65W Allweather (high beam) $34.95 per pair
I recommended the Allweather for the high beams for mixed weather driving.
