I would use BMW. They are not that pricey and a PITA to change. I've been using BMW of Morristown recently as their prices are the best I can find. Husker BMW (huskerparts.com) also has very good pricing and is closer to you. ECS Tuning also has good prices and sells both BMW parts and better quality aftermarket.

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David.X5
2001 X5 4.4i Sport
SOLD! at 160k miles