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The metal brackets just had to have new holes drilled to line up with the Alpine and the plastic Metra brackets. Dremel was mainly used to hack the Metra brackets. All in all it was very easy to do. This is a must do if you use the Metra kit I believe. I didn't like how the top of the console moved without the metal brackets and the kit also sagged a little.
Shane
I just used the full plastic bracket. I just had to drill my own holes for the HU. As long as you are careful putting in the plastic and dont snap it, it holds just fine.
As for the curve, not normal. My kit it kinda wants to go sideways but once the HU is in place its all good because the trim around it, keeps it in place. It shouldnt be curving inward tho.