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I am looking for some advice. I have a 2010 model Crown Victoria. I am wanting to take the back deck out of it and fill in the holes for the back brake light and make the deck it self sturdy. Then cut out spots for 6x9's, the car has 6x8 speakers, but I have already replaced those with one set of 6x9's. I want to add a second set along with make that back deck look better. Was thinking fiber glass but not sure because I have never used any type of fabric or resin. Any ideas?