Craig- Just wanted to update this post a bit, hopefully to make it clearer.
In addition I have some specific questions (bold red) so if anyone has answers to them, please let me know.

For the E53 X5 and the E70 X5:

- Eject Box (aka "System Base Plate") current p/n: 84-10-9-168-940 Retail $101.57 (All the other p/n's (including -063, -415) have been superseded with this one)

- Snap-In Adapter Apple iPhone 1G: 84-10-9-182-792 $135.97 Retail

- Snap-In Adapter Apple iPhone 3G/3GS: 84-21-2-151-038 has been superseded with 84-21-2-158-682 Retail $152.94

Now, according to the chart I posted on this thread:

http://www.xoutpost.com/electronics/...full-list.html

The E53 X5 requires these two parts for either of the two iPhone snap-in adapters:

Eject Box Frame: 84-21-2-153-098 $99.65 Retail

Adapter Cable: 84-10-9-205-271 $10.20 Retail

So I assume that eject box 84-21-2-153-098 is to be used in place of eject box 84-10-9-168-940 when using a iPhone snap-in adapter and this makes sense since the 84-10-9-168-940 eject box has side walls and thus is much narrower than the 84-21-2-153-098 eject box that has no side walls on it and can accommodate the iPhone snap-in adapters properly. Other than the actual size difference of the two eject boxes (84-10-9-168-940 & 84-21-2-153-098) I don't know if there is a functional difference electronically. If anyone knows let me know.

Now, apparently there are newer iPhone "USB" adapters for E70 X5's made after 10/2008 (2009 model year) that not only allow for telephone functionality, but also for music playback from the iPhones:

- Snap-In Adapter Apple iPhone 1G: 84-10-9-164-213 $195.02 Retail

- Snap-In Adapter Apple iPhone 3G/3GS: 84-21-2-151-043 has been superseded with 84-21-2-158-683 Retail $ 220.92

- And a snap-in adapter for the Apple Touch: 84-21-2-162-534 Retail $203.94

I have no idea if any of these three will work or can be modified to work on an E53 X5, any clue?

This post is a work-in-progress and I will try to attach as many pictures as I can to it. So far I have found pictures for -038, -043, -098, -271, -415, -682, -792, -940. I still need photos of -213, -534, -683. If you have any additional information or photos or better photos that you would like to add please let me know.

I have some final questions that hopefully someone can answer:

1. I know the 84-21-0-415-023 (Motorola RAZR V3, V3i) snap-in adapter can be custom modified to fit a 84-21-6-933-415 eject box. Will a modified 84-21-0-415-023 also fit the 84-10-9-168-940 eject box?

2. Will the 84-21-0-415-023 snap-in adapter fit the 84-21-2-153-098 eject box?

3. Does anyone have photos of the 84-21-0-442-784 (Motorola V8, V9m) snap-in adapter?

4. Does anyone have photos of the 84-21-0-442-785 (Motorola V9) snap-in adapter?

Attached Images