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Are All Mazda 3 SP23's 5x7" speakers? If so, does that mean to put in 6.5" speakers i must make brackets?

Hey Guys... I'm new to the forums here, i did s forum search but didnt find n e thing on Mazda 3 SP23. I get my new Mazda delivered tomorrow! I pick it up at 4pm..so im quite excited at this. I've got some speakers i wanna get put in, its a new car so im not sure if i wanna do it myself as i...