Hi,
I will have a spare glass when I finally get my car resprayed later this year, as I have just bought a replacement lamp unit for mine, I,m only replacing it as it has always filled with water despite trying to reseal it the glass on it is in one piece.
Though the glass is not available separatly a complete fog light unit is only about £50 New, I will pm you when I change it and see if you still need it.