Modular Aluminum Pet Patio Door with Single Pane Glass & Clear Flexible Flap - Fits 1" Aluminum Track (Medium, White) | Durable Dog & Cat Door for Sliding Glass Patio Entries | Perfect for Homes with Pets

I knew going in that this might be a tight fit for my back door and I was right. My door was just slightly smaller than the minimum height recommended. The track on my door was about 1/8-1/4 inch too high so I had to get my angle grinder and cut off about 1/4 inch from the top piece. Easy enough. After that it fit perfect. If your door is within spec this should be pretty much plug and play for you.Some small issues I experienced:1. the bolts that hold the 2 pieces together aren't flat so they create a small gap when you put the weather stripping over them. Would have been better to use counter sink bolts.2. I bought the medium size door and it works great for my cats and terrier, but not my chihuahua. The bottom of the door is about 4-6 inches off the ground and he's just too short to get over it. Something to keep in mind if you have a short dog. I'm going to use something for steps or maybe put some kind of ramp there for him.3. My door is severely out of square so there was a pretty big gap between the weather strip and my door. I had to use a dremel and sand off quite a bit of weather strip near the top and down towards the middle to get it flush w/ the door. I was hoping to be able to find some weather strip that wasn't so dense and would compress easily but didn't have any luck at walmart or lowes. Wasn't too bad but there was quite a bit of cleanup after. Unless your door is perfectly square you might run into a similar issue.4. No matter how hard I try there's just no way for me to get the weather strip close/tight enough to close all the gaps around the edges. Not a big deal in the spring/fall, but could be more of a big deal in the middle of summer/winter. Right now for me (January 2023 in Cali) it's not too bad but I can still feel a very slight draft of cold air. If you live somewhere where there's extreme cold you might be impacted more.Those were the biggest issues for me. Other than that the door is easy enough to install and my cats love it. Funny enough, my terrier still doesn't know he can let himself out/in, but my cats learned almost right away. Seems like my chihuahua knows how to use it but he's just too short. And I love it because now I don't have to leave the door open anymore, which will help keep the bugs (especially mosquitos!) out.Not sure what I'm going to do this summer. I like to keep my window open as much as possible and use the AC as little as possible, so I might have to keep switching it between the screen track and glass door track. I didn't test it out on the screen track so I'm hoping it'll even fit there, I'll find out soon enough.Overall, glad I got it, price wasn't too bad, easy enough for me to modify to get it to fit, would recommend. Oh and no drilling too so that was a plus.