Im trying to find out will the 90bt fit in the 2006 Expedition with no problem

I installed an F900BT in an '06 Expedition Eddie Bauer, it fits just fine, and I think these are the exact same units (F900 is satellite radio ready is the only difference _I think_). In fact there is lots of room once you take the dash panel off.

We purchased a factory harness adapter which worked great, and we also used the PAC-SWIPS for the steering wheel buttons, which worked pretty well also.

We just did this about 2 weeks ago if you want to ask any questions while it's still fresh in my mind.. feel free to email.

...(F900 is satellite radio ready is the only difference _I think_)...

all three (f700, f900, and f90) are all sat ready, but yes they are all the same size.