Looking to get the specs on the size of all the speakers including the rear back seat

 

The tweeters in the corner of your dash I'm not sure about but...
The front door speakers are a 6 1/2"
The rear deck speakers are also a 6 1/2"

 

And the "sub" in the center of the rear seat is just a 6x9.

 

Pretty sure I used Infinity Reference REF-375TX tweeters for the dash speakers.

The plastic mounts shown in the picture are removable.

I also had to shave off a little of the plastic brace behind the speaker cover using an Xtaco knife, but other than that they fitted really well.