Need help asap installing clear lenses

[Ricochet]

Okay so I got these in the mail:



I took out my headlights, heated them up, split them apart, but now I'm stuck. These lenses fit over top the front part of the housings and I have no idea how to split the actual lense off the black part. I think the whole piece is the same thing, just most of it painted black..? Do I have to use a hacksaw and just kinda eyeball it?