You can get small clear wheat size bulbs from online electronic stores like the following. They are cheap. Order way more than you need. There are many e34 switches that the bulbs can fail. Once you learn to fix one, others are similar. google this forum and others for the how-to.
http://www.delcity.net/delcity/servlet/navi?action=home
Thanks,
1995 525i Auto, M50TU 2.5L, EAT chip, 1/95 build, USA, 205/65/15 tires, ASC+T, HID, lumbar, EC Mirror, BMW Alpine 5 radio with BMW-Pioneer CD Changer, abt 236k miles, Oxford Green/Parchment