[gtkid2002]

Just a suggestion for if you're still looking for specially shaped glass, try finding a small aircraft boneyard, and looking at the glass from one of those. I think something like that would be cheaper than getting one custom made, but you'd have to design around it to a point. Also might be hard to find a replacement.

That or maybe it's possible to bend the glass with careful use of a torch? I'm not familiar with automotive glass though.