This model is designed to fit the Ideal Pet Products Ruff-Weather Pet Door with Telescoping Frame, Extra Large, 9.75" x 17" Flap Size. I doubt it would work with another size of pet door.
I created this small part to replace the broken magnet retainers in my doggy door. Over time, the thin strips of plastic that hold the magnet bars in place have been broken, due to me trying to clean under the bars. This piece is meant to fit snuggly between the wider supports and catch on the spur at the bottom of the magnet bar and keep it from being pulled out. There are spots for three of them in the door frame, but I find that one is enough to keep the magnet from coming out.
This model has a very small tooth that holds it in place. I used variable layer height to get the detail required to print it, but if that option is not available to you, I'd suggest printing this at a finer layer height like 0.08 mm.