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Go to Crutchfield.com and they will have all of the sizes of your factory size speakers for your car.
You don't need factory speakers. Just buy the same size speakers and install.
5 1/4". I believe that 6.5" can fit there also but I'm not exactly sure how.
6x8
2006 E250 speaker size is 6x8"
The dash has 3x5 and the door and rear deck speakers are 6x9. Enjoy. ChicagolandAreaModernMopars . com
6x8
6x9's
4in speakers in the door and dash
6x8
2006 Ford F-150 Pickup SuperCrew Cabwith factory subwooferFactory replacement info:In-dash stereo 7-7/8" depth; Size code DD,E,F3 Front speakers Front Door: 6x8" Rear speakers Rear Door: 6x8" Far rear speakers Behind Seat: 8"
The 2006 Lincoln Navigator has a 5.4 L base engine size.