5x7 are OE iirc. anything can fit when you have a cutoff wheel and time. I squeezed in a much larger 6.5 then stock speaker with spacers and new mounting holes.
Would these be good for the rear doors? I want midbass drivers. Yes, I am running a 4ch. Clarion 425 that's powering my front Infinity components, and actually my factory rear doors(except it's turned down more in the rear so I don't blow them). Has anyone measured the max mounting depth for the rear doors? If so, I'd like to know now, so I don't have window issues when I take this project on. I removed my subwoofer setup temporarily until I can fab a fiberglassed box in the corner of hatch.