I think my rear speakers are the same as yours, and they were a pain to take out. They have 4 screws I believe that go in from behind, and i ended up using a Phillips socket on a ratchet to get them out. It appears as though there are only some bolts that hold the entire upholstered speaker grate in place, but it was much easier to just take out the speaker by itself when I did it. One thing to make sure of it to be positive that the speakers you order have removable grates before you take the old ones out. I ordered some 4 new Sony's and didn't even think about it until after I removed all of the speakers, and it turns out that there was an extra tweeter built into the grate. I ended up just reinstalling the rears, and only put the new ones up front. Replacing the old speaker wiring shouldn't be too bad on the starboard side, you can just fish the wires right up the side cubby, under the carpeting, and there should be access to the inside of the hull right next to the console. The Port side will probably involve taking the wire forward to the bow, and either going around the seating, or trying to go under and across the ski locker.
Let me know if you find a easier way to get the rear speakers out, I may finally replace mine once and for all.
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