Left side tilt latch Patriot Window

This is a tilt latch for a Patriot window in a Ryan built home. I have included the measurements as best as I can. The latch is about 7/16" deep and bottom curved area is 9/16" wide. I'm trying to find the part number and if you have them. I'll need about 20 lefts and 20 rights, assuming I replace them all. Are the ones you might have plastic or nylon. It seems like the constant sun makes the plastic brittle.