I have these speakers in my front doors. I bought four of them, but they did not fit in the rear of my extended cab, so I ended up only using two. The P680Cs frame & tweeter assembly mount first, then the woofer mounts to the frame, covering the initial mounting holes. This is not compatible with the reverse mounting technique Ford uses in the rear of the 2-door extended cabs. Because of the way the speakers mount there (reverse mount onto the grills, then the grills mount onto the body), they just wouldn't work.
Would've LOVED if they fit into the front and the rear as I was completely blown away by their performance. Really good sound quality! Highly recommend them for the front doors of anyones 2-door extended cab.
2009 XLT 2.3
Pioneer AVIC Z130BT Nav System, Kenwood P680C 6x8s (front), Pioneer TS-A6872R 6x8s (rear), Pioneer TS-SWX251 10" Shallow-Mount Sub, Reverse View Camera, XM
Roll-n-Lock E-Series Tonneau Cover, 12v Outlet in Bed, ScanGauge II w/ BlendMount, Optima Yellow Top Battery, BUSS Auxiliary Fuse Pannel