I have a Petsafe Ultimate Extra Large pet door and needed to replace the flap. After doing several searches I found out Petsafe no longer makes this pet door nor the replacement flaps.
I tried to find another brand with a similar size opening, but there are none... no consistent sizes in pet doors!
I found this replacement flap, which says it should fit so I took a chance and ordered it. It fits perfectly and is made much better than the original Petsafe vinyl flap. This rubber flap is heavier gauge than the vinyl so it hangs straighter and flat. The magnets work well to keep a good seal with the frame. I'd definitely recommend this replacement flap for the Petsafe Ultimate pet door.