maz89
+1y
for the radio, you need to remove the bezel that goes around the radio, steering colum, etc. just becareful and make sure all the little bolts are out. once it's off the radio just unbolts, and unplugs. just take your time, and you won't mess anything up. it'll only take a few minutes to get it out. the doors take 5 1/4's I believe, but not exactly sure. go to to double check the size. And yes, there's a hole in the firewall, it's best to poke a small hole in the rubber boot the main harness runs through and run your wires beside the harness, it'll be on the driver side under and behind the dash, it's tight to get to, but that's the best and cleanest place for the wires. and I think the measurement from the floor to the top of the rear seats are close to 2ft. if you got anymore questions, just post'em up homie. hope this helps...