Front Speakers

Not factory, but my hats off to the guy who hand drilled all those holes.
Agreed, that looks custom for sure, but a better solution than cutting the door panels. I wouldn't do that mod now, but whoever did it made a nice job of it, so why not use it? When I had my Road Runner, you could still buy the plastic footwell panels from the dealer on the cheap. I bought a set of those and cut holes in them for 4-1/2" speakers. Not as nice as those in post 11, but it worked well, and I'm sure the guy who owns the RR now appreciates having nice (probably brittle and flakey) originals.

There's not going to be an easy way to get at that speaker. It might involve removing the instrument cluster. Truth be told, that's not that bad a job. There are threads on here to help you through it. Before doing that, get a strong light, and look up under the dash, and see what you can see. Can you reach up there? If it looks like you could if you had more maneuvering room, consider taking out the seat. It's a bit of a pain the first time, especially a bench, but a bucket is easy, and gives you room to lay on your back to work up there. Just be sure to disconnect the battery before you go yanking on stuff under the dash. Good luck, and please report back with progress.