Polo Mk2 breadvan sunroof - factory fitted?

[barnacle]

Hi, we have just bought a very tidy 1990 polo mk2 breadvan - with the 1.3 litre engine and 5 speed gearbox. It has a glass "pop up" sunroof fitted and there is quite a lot of wind noise from it (even when closed). I am guessing that it needs a new seal - but where to get one? is it likely to be a factory fit or more likely aftermarket? There are no VW marks on the glass itself.
Thanks for any advice

[Crasher]

There was a Polo 2 factory fitted glass lift out panel roof but it is very rare and parts are hard to get, it has a distinctive operating knob