BMW X3 2004 TO 2008 Speaker Sizes:Check out our Speaker Index page.
Front door: 5.5"
Rear Door: 5.5"
Buick Enclave 2008 Speaker Sizes:
Front door: 6.75"
Rear door: 6.75"
Here you can order good name-brand inexpensive replacement speakers that fit properly and sound good with an OEM or aftermarket radio.
Installation Kits Index Page.
Harness and Radio Plugs Index Page.