Just found this info on Bimmerboard:
"Mercedes Part #: N 910 14 1 000000 (This is the same bulb that the E32's use)"
So that means it also fit to E34, check the prices.
Cool, useful information! I ordered all new bulbs from BMA, they have nice packages of them that they sell.
Lowered with blue h&r(?) springs, Bilsteins, tint, 19# design 3 injectors, Dual Magnaflow
southwest WA