I don't know if you can order just that piece. I don't know if they'd fix it, but if your car is still under warranty, it wouldn't hurt to have the dealer look at it. They may just replace the whole thing. If it's not under warranty, or if you don't want to take it in, you may try to find one at a junkyard. If none of that works, like you said, you could always try to make your own.