ETK 800 glass texturing problems

I decided to try to paint the glass of ETK 800, but i found, that in original textures windshield and rear windows are only in the form of halves

For example, Sunburst (whole glass)

Are there any ways to paint it entirely without mirroring the other half?

 

I think the only way to "fix" it is to unwrap the neccessary meshes yourself & then add them to the game as a mod