guys who are planning on doing an install in your X5... i hope this helps:
FRONT WOOFERS: Mounting depth: 2.585", Height: 1.113", Magnet diameter: 3.878"
REAR WOOFERS: Mounting depth: 2.707", Height: 0.65", Magnet diameter: 5.1"
and supposedly when you use 5.25" woofers, you have to use a mounting bracket to hold them in place. so it appears 6.5" is the way to go!
i am going to give myself another day to sit and stew upon this matter before i pull the trigger and order something.
i will post some pics of the newly installed gizmos when everything is complete... i'm hoping the setup will make me grin ear-to-ear when i first hear it
PS - if anyone needs to buy a stock BMW radio or cd player... here's links to my auctions on e-bay!
BMW x5 E53 Radio in Perfect Condition Audio Display Control 65806914606 | eBay
BMW x5 E53 Business CD Player in Perfect Condition Radio Display Stereo | eBay
^^^^^^^^^^^^^^ i have no idea on the specific model of the radio... from what i understand, there's like 4 different versions made by OEM.