I have a 2001, and if the helm is the same, I think you will have some problems. I just installed the E80, and it would not fit in the space left side of the helm. I measured several times, thinking it would fit, until we got the actual unit out there. The problem was that the space is not a square, more of a parallelogram. The bottom length is longer than the top. I could have made it work, but it would have looked like sh*t. And if the E80 would not fit, the c120 will not.
Here's a pic of the helm before the installation. I don't have a good pic after, but I installed it right behind the wheel where my paper map is. I was skeptical at first, but I do like that location now. If you look past the girls, you can see it installed.
