Double Glazed Windows Black Sealing Strip
 

I have noticed that some of the rubber strip is missing from my patio door leaving a gap between the glass and the frame. I realise these are sealed units but I would like to repair it to stop the families of spiders setting up home there. I have looked at various diy sites but can't seem to locate this strip. Any ideas where I can buy some please?

Patio door
 

What brand patio door?
www.mjswindows.com

Anglian. But what Ive done is put black insulating tape on it and you can't see the difference.