UKPassats

I feel like I'm a bit stuck with replacing front windscreen to my b5 passat. I have windscreen and mastic +primers for it, but now I can't find where to get that rubber seal which goes on top side of windscreen. You may think there is just gap between glass and roof, but when you look closely, there is rubber strip under glass to cover gap between roof. Vw part finders don't show anything in there, I have found even part numbers for oem mastic, primer and cut out string no success with that rubber. Maybe I'm blind and just don't see it. So any help would be great, either part nr or any universal rubber seal/weather strip which will fit.
Thanks, Ray.