I tried to fit one on my car ages ago and it wouldn't go. It was very close though, no more than a half inch off. Keep me in the loop with this, Skrilla, I've been talking with Mike for quite a while about getting one made up for us. And an upper one that fits properly. Unfortunately HB is like an hour from where I live, so its hard to drop by and try to slot myself in...
The story I hear is that the front lower makes the most difference in handling, followed by the upper rear and then the upper front. Essentially the opposite order that everyone gets them in...