I've just replaced both front and rear speakers with an Alpine R-S65C-2 for the front and an Alpine R-S65-2 for the rear. The tweeters were the biggest challenge to fit, I removed the original ones and the mounting plate was used to fix the new tweeters to as the shape is rather odd. I used a sharp scapel to remove the glue holing the OE tweeter to the frame
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Once that was done I bought a hot glue gun from Amazon and fitted the new component tweeters.
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I utlilised the original wiring plug and soldered the new adjustable crossovers onto the remains of the wiring left in the plug.
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Here's a comparison picture of the difference in size.
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The OE filter was removed as these new tweeters come with a separate tuneable filter where you can vary the output from +3dB to 0dB to -3dB, I preferred the sound on -3dB. I screwed the tweeter frame back into the car and I placed the tweeter filters behind the respective dash end panels.
Now the sound in the car is really superb, lovely clear treble and fantastic mid range and base, along with the sub woofer in the boot and the pioneer amp I think I've got the optimal setup at the moment.