What ill do is cover the basics of how to install it then if you have any questions or if im not making something clear let me know and ill explain more.
I simply mounted a 6.5 inch x 1 inch mdf spacer to the door by countersinking 3 screws through the factory screw holes that hold the door trim around the speaker(those 3 screw holes around the speaker hole).
once that was mounted i cut the door plastic out so i could start test fitting, you need to cut out the section around the speaker so it will fit over the spacer.
You just roughly cut it out then put the door trim back on the door and see if/where the spacer is hitting the door panel, if somethings hitting trim it off, i took the top edges off my spacers so i wouldnt have to cut off as much plastic. sorry for the poor pic but if you can see where the wood has been exposed on the spacer thats where ive cut it but once you line up your panel you will see where you need to cut.
keep trimming untill your door panel fits back on then your done, first door took me a little bit but once you know how much you need to cut out the next is much quicker, i used a retractable razor blade to trim the door.
This should give you 75 ish mm depth to the window if i recall correctly, which should be enough to fit most speakers,
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