The vent will have to be removed. There are clips and screws on the inside that have to be released and removed. At the bottom inside edge behind the air flow vanes. The bulb carrier is in the back on the bottom. I think it's a 2.2 W bulb. I bought some of these at Auto Zone. Made by Sylvania for use in European cars.

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Jeff L
1987 300e
1989 300e
1987 BMW 325