I've been on a quest to really weatherproof my home, built in 1962. There are sliding glass doors going out to the backyard and I just realized that it is completely open to the elements--and explains why flies are constantly coming in (I watched them fly through). Please see images here https://imgur.com/a/9l6pm5o I have one image of the bottom, where you can see light. The top on looks better but I believe it's probably open as there is some plate screwed in, but almost like it's been torn up.
When I search for sliding door weatherstripping, I don't find anything that seems remotely like it would fit. What am I missing here? Thank you!