I managed to break the skylight on my T25 van this weekend

I've been looking for replacement and am struggling, as I dont know the make. I found a second hand one on ebay http://cgi.ebay.co.uk/ROOF-VENT-SKYLIGH ... 43a7405de5" onclick="window.open(this.href);return false; but it looks like it has similar stress cracks to mine (before it completely broke).
If anyone knows what make this is, or where I can find a new one I would be hugely grateful!!
Thanks in advance!