audi cab rear window?

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hi, i was wondering if anyone knows of a good supplier for a replacement rear windscreen on a '97 audi cabriolet? my mum's has seen better days and a replacement from audi is knocking on for about £300 ish... seems ok but it's only a simple zip out item and i'd like to knock a bit off if possible. any ideas would be much appreciated.
cheers guys.

[shred]

hi, im in south wales close to the severn bridge. i think im right in saying the window zip's into the hood without too much bother but the only company ive found on the web ships from the U.S. andover is a much better bet.

thank you for taking an interest, its much appreciated.