Well I own a car audio sub enclosure comapny and i am a former Iasca judge and competitor. Just to give you my back ground.
I use Boston pro 60s in my 07 limited and they have everything incliding the plates to mount them in your expedition. All models.
If you do not want to spend that...
I build alot of boxes for expeditions . Probably 8 a week. Its seems most boxes i build are for 3 12s or 2 15s in your year model and they keep the 3rd row seat. Just email me and ill send you some pics. [email protected]
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