This is a "vinyl" insert that holds the bottom of the screen in place in an Alenco Window

Thank you for reaching out to us! We don't sell a replacement for the screen retainer strip you show in your photos, unfortunately. The closest we have would be the 55-124, but I'm not sure you could adapt it to your window frame. Another idea would be to use one of the clip-on clips that slip onto the screen and clip onto the outside of the window frame such as the 70-176 and the 70-212. Take a look at the 70-177 screen clip set as well. Review the specifications for these parts and see if you think you could adapt one to your window.