I bought my wife an Azera on 2 May, and asked the dealership if the Bluetooth option was dealer-installed. It is. Of course the price was very high, so just as you did, I did some searching.
The factory kit is part number U8780-3L000-xx, where the 'xx' is the color code. J9 is the tan one.
So far, I've found Internet dealers willing to sell the kit for $325-333, which is still high.
I found out that the kit is manufactured by JCI Industries in Indiana, and is the same kit supplied to Toyota, Kia and others. The kits are trade-named 'BlueConnect'. With this information, I went back to the Internet and located an independent audio dealer in Kalifunny who sells the kits for $199.
http://www.al-eds.com/BlueConnect-1110BCOK-p18907.html. One caveat on color: Al told me on the phone that his colors are Toyota colors.
Both kits have the same functions: stored numbers, omnidirectional microphone and separate speaker, so there's no interaction with your stereo system.
The factory kit comes with a panel that replaces the sunglasses drop-down bin in the overhead console. If you use the aftermarket kit, you have to modify the sunglasses drop-down bin, but there is room for the head unit in the bin. The transmitter is a flat unit, about the size of a credit card, and is about 1/8 inch thick. It will slide easily into the bump in the headliner just in front of the sunglasses bin.
Both kits have wiring harnesses that connect the transmitter and a power source. The factory kit has a power connector that interfaces with the one for the dome lights, while the aftermarket kit doesn't have a connector. Also, the factory kit has a wire for the mute function, but no connector, so you have to siamese it into the wiring on the back of the radio. The aftermarket kit doesn't have the wire. We don't need it anyway, because the Azera has a MUTE switch on the steering wheel. This means that we don't have to tear the dash apart to install the aftermarket kit!
Installation effort for both kits involves popping the relevant section out of the overhead console, doing the installation work for the head unit, locating the transmitter and using the kits' double face tape to secure it, then wiring things up. Estimated labor is 2 hours for novices like us! Most of that time will be modifying the sunglasses bin if you use the aftermarket kit.
I'm going to buy the aftermarket kit this weekend, and I hope to have it installed within two weeks. If you're interested, I'll post my experiences.
Hope this helps!
Tom in Arizona
This post has been edited by Login: Tom in Arizona: May 22 2009, 11:46 AM