The part number for the XM kit is: 86100-0W100. Again, there seems to be a wide range of prices for the kit. Remember, since the dealerships are privately owned they can set prices totally on their own. The production date or date my car was shipped from Japan was March 7, 2004-again, well ahead of the date that the parts guy at Keith Lexus stated. Also, the 05 ES 330 does not have Bluetooth, so have no idea what he may have been looking at when he gave out that info. By the way, you can find out all sorts of good stuff if you give your dealership a call an d speak to the parts guy. Once he has your VIN he can tell you when your car was shipped, what it has on it, engine number, etc. The antenna is mounted on the trunk lid. Mine is a few inches down from the top on the right side approx. 3/8-1/2" from the edge. It is a square box perhaps 3" x 3" x 3/4", is black in color. Again, I will get used to it and having XM is well worth the little cosmetic annoyance created by the antenna. Hope that answers most of your questions. Again, if you have the navi system with the AM-Sat button then you are set to go. Mike