Originally Posted by searay93

By park brake I am referring to the wire connection for the park brake circuit that goes through my GMOS box to my Alpine head unit

Originally Posted by Doc Olds

Either will fit, and you do not need any adapters. I put P1650 6.5" 2 ways in the front doors, and P1675 6.75" 3 ways in the back doors using XTC Baffles with the bottoms cut out for moisture protection, after Dynamat Extreme to the bottom 12" of the outer door skins, and some to the inner skins. I am very pleased with the upgrade over the OEM speakers, HUGE! Not talking about volume, but sound quality.

Still using my OEM 6 disc changer until I score an Alpine ILX-W650 deal and have time to play with it, ..... hence my interest in this thread.

Question, did you need any head unit surround to tightly fit the factory opening?