Better Bilt windows have been out of business since 2010 and as far as I'm aware of the parts are no longer accessible. My house did not have window screens so I have been using DIY window screen kits and designed these replacement clips that provide pressure on the screen's frame and push it up against the frame of the window to ensure a full seal. These are near a 1:1 replacement clip. 

Ensure the following (can be edited to adjust to your needs)

• X axis: 15mm
• Y axis: 38.5mm
• Z axis: 18mm

3g (0.85m) of filament used & roughly 22 minute print time

Recommend printing in PETG as this WILL be exposed to the elements and the sun (Or any other filament that has UV protection). Or if you don't care PLA works fine as well.