Trying to find the right weather strip for sliding glass door.

It's impossible for me to say what weatherstrip you need from this photo. It looks like you need a wool pile type, but without knowing the size of the wool pile's base and the pile height, I can't be anymore specific. If you can remove a sample from the door and provide those dimensions next time you are near the door, then we can try an identify a specific replacement for you. In the time being, you can view our selection of wool pile here.