Just to bump this up to the top.
I need two new ones since a prat of a taxi driver gave me the choice of kerbing two of mine, or having the side of my car scraped.
He u-turned, but first came into my lane to do it. Didn't manage to get his number, so 2 chicago's have now to be paid for out of my own pocket. Grrrrrrr
(only cosmetic damage tho luckily, so I can wait but would rather get them on now if anyone DOES know where to get them from).