I can't be sure from the photo, but many of the slide seals are 2 piece. There is a base seal that includes the wiper and a bulb seal that covers the attachment screws on the base seal. The top wiper seal flap is usually longer than the side wiper seal flap so you need to measure. The bulb seals are interchangeable. Although many use Treckwood .... I've used Steele Rubber Products for several projects.
https://www.steelerubber.com/camper-rv/slide-outs