I went with 6 1/2" Speakers. Finding mounting brackets was a pain. CRV adapters plates were $35 for 2. (2) Speaker pigtails were going for $10. Then I saw the plates linked below. They are for a Civic and I took a shot on the size. I figured you get (4) for $21 and if the plates fit they fit and if they dont, oh well.
So the plates have (2) mounting tabs at the bottom. These do not align with the CRV tabs. So a popped them off.
Before you remove the old speaker, use a marker to outline the arch of the speaker mount. I used (4) self tapping sheet metal screws on each mount. Everything aligns perfectly with the CRV door panel. And my tunes have never been sweeter.