I sent emails back and forth with Watanabe a while ago. Unfortunately they don't make very wide 17 inch wheels, so 9 was the widest I could go in the rear. Might be good for a narrow body though. They look period correct, like minilites. Of course the yen is very strong now, it might not even make sense other than to be a little different.
I don't know much about the more modern styles though, since I didn't think most of the styles I've seen would look "right" on a 911