My Z had the base stereo in it. I was able to mount a pair of Alpine SPR-17s 6-3/4 woofers in the doors using the adapter rings that came with the speakers. They were maybe a 1/4 inch thick and did not require any cutting of the stock speaker mount. It was a simple bolt/screw in. But then again, I think they are only 2-3/8" deep.
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Aloha!
Honolulu, Hawaii. '09 370Z White, 6spd Stillen Gen-III Intake/CBE, Alpine Entertainment
Volk G2's 19x9.5F 19x10.5R, Nitto Invo 285x30F & 305x30R
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