Schmiedmann - Styling/Tuning/Spare parts for BMW - New parts
BMW Accessories Lighting and Carbon Fiber from Bimmian for M3 F30 E90 E92 E46 M5 E60 F10 X5 Z4
Super Bright Car LED Lights, LED Bulbs, Halo Headlights, LED Tail Lights (good source for LED bulbs)
BMW Parts and BMW Accessories | Bavarian Autosport (not great for X's, but they do have some decent stuff)
BMW Parts and Accessories at GetBMWparts.com (Tischer BMW's online store, great prices on original parts, plus they have tons of exploded diagrams if you're not sure what you need to order)

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-"Wax on, right hand. Wax off, left hand. Wax on, wax off. Breathe in through nose, out of mouth. Wax on, wax off. Don't forget to breathe, very important." -Kesuke Miyagi