If you have ever seen the stock speakers that are built into the actual mount that bolts to the door panel, then it's easier to envision what I did. I ripped out the stock paper cone and cut the plastic supports behind the cone the converge around to hold the magnet. I took a file to flatten out the inner diameter of the mount. I used a wire cutter to cut off the wires from the stock speaker connectors to the plug. I soldered new wire onto the stock plug, to the new speaker.
When removing the cone, the adhesive that holds it to the mount around the top edge has an empty cavity. I filled that empty cavity with JB weld plastic weld epoxy putty (when hardened it is drillable). I left it to harden overnight. I centered the new speakers on the mounts, clamped the speaker to the mount so it didnt move, then drilled the holes for the mounting screws. I used a sharpie to mark the outer edge to show where the holes are drilled. Then I put a thick layer of Permatex black silicone adhesive sealant around the rim, placed the speaker carefully back on to minimize any movement and mess from the adhesive while making sure the holes line up with the marks place on the outside edge. I put the screws in nice and snug, mounted the bracket with the new speakers back into the door.
I didn't take any pictures of the process, so I hope my explanation makes sense. But yeah, the Rockford's fit near perfectly, and for $50 bucks, sound better than the stock garbage