This is a DIY for a 2005 Corolla replacing the rear factory speakers to aftermarket speakers .
The rears are 6 x 9 and to make it easier purchase a speakers adapters from ebay . Part Number is
This is a very easy DIY . Remove the bottom of the rear seat then from there you can start pulling the plastic covers off starting with the clips where the hooks of the seat is .
Then go to the side of the rear then you can pull up the rear deck be careful if you have a rear wing there is wires you need to unclip then in the front you need to umclip that light plug too .
Then you can start removing the factory speakers . be careful you don't hit the back window with your ratchet .
Speaker rear adapter number is SAK008_69
You can modify the speaker wire to the factory plug .
Install the adapters first then you can put the speakers in . Make sure the speakers are nice and tight and they do not rattle , If you still have a rattle use silicone to keep it from moving . Once you tested the speakers then you can start putting then car back together .
Make sure you plug all the wires back correctly .
More DIY at www.corollacarclub,proboards,com