hey, have a 97 328i that is prewired for the changer. just got one with the bracket off ebay but i have never seen exactly how they are mounted. does anyone have a pic of their factory changer i can see?
there are two brakets, an L and S shape. the L attaches to a piece of metal in front of the passenger taillight that runs parallel to the car and S to a bolt in the top of the trunk sheetmetal. The CD changer slides on and off the side rails of the plate the brackets mount to. I used the braket to install my cap, but it give you an idea and location.