Ryno Mfg makes one that could be anodized and is pretty slick I have used it in a few cars.
http://www.rynomfg.com/
click under products
scroll down to rear view mirrors, don't mind all the mini truck stuff
You will find the universal, oval mirror
I could not figure a way to post the link, something to do with the website. Or me.....
If your interested let me know.