Do I have to support the back of the head unit?
you wont need one
btw, my current deck is an alpine 9855
Lacking the proper rear/pin support... just something shimmed to hold the bottom of the radio will do the job. Could be as simple as cardboard layered thick enough to support it.
I'd do something though, a little is better than nothing.
http://www.crutchfield.com/S-SxD3e1w...sp?I=003GMK390
here's a zoom of the install kit for our cars.
http://www.crutchfield.com/S-SxD3e1w...display=XL#Tab
Towards the left lower half of that pic, you see those things with the nipples on 'em. You bolt it on to the back of the radio. That provides your rear support (assuming you didn't knock out the back plastic of the dash hole).
Sorry if this reply is written half assed.. I'm mostly drunk and partially asleep.
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you wont need one
I agree. I have many HU installs under my belt, and the cage has always been enough to keep it snug, even through track runs, etc.
The possibility of making the cage work alone also depends on the quality of the dash kit.
I did have one dash kit for the camaro, the metra, which after trying over and over I couldn't get to hold the radio properly, so I refered to the sticky and got that kit and it was solid.
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