http://www.brandmotion.com/ipoddock.php if you have the over head rail system,
http://brandmotion.com/ipod.php if you don't.
I've had phone dealings with brandmotion a couple of times, always top notch customer service. I placed an order just today for some components, I can keep you up to date about the results if you like, but to me, these seem like the sleekest iPod to OEM radio integration available.