STL file to make side marker lenses for a 68 Dart

I need an STL file or my son could design something based off original. There are some filaments that we may have no experience with but PETG sounds like the way to go for this project.

* I just looked on all the STL repositories and did not see anything already made. If you are willing for it to take a few days and send a lens my son can draw something on Fusion360 and print it. But, we don't have clear PETG.

Maybe someone else here has clear PETG. Getting that is probably the biggest part as this design looks really simple.