What's the 'beading' called that is around the door and window frames of double glazed windows. It sort of cushions the door as it hits the frame. It looks a bit like the expanding plastic covered wire that you hang net curtains on! Ours has become flattened and we can feel the cold air creeping in!
I suggest that you find the ends of the original gasket on your door and check the shape and size of the cross-section against the companies page of gaskets and descriptions.
Hope this helps.
If you are going to change the rubber gasket, after checking that you may get away with adjusting the hinges then have a look on ebay a couple of companies send you a sample pack (very cheap) you can then check which one you need then order. (there are a lot of different ones out there) this way you know you have the correct one, very easy to install, done mine a couple of months ago.