Like a knife latch

Thanks for reaching out! The plastic clips you are searching for look a lot like our 70-208 Peachtree Screen Latch Set. Take a look over the dimensions below. Compare them to your existing latches to determine if these are the right replacement.

Alternate image for 70-208

The rivets are sold separately. Although, it does not appear we carry a rivet like the one shown in your photo. You'll need to keep that rivet for the installation. If they cannot be reused, I would suggest taking them to a local hardware store where they may be able to get you matched up with a replacement.