Need ideas for sealing hole at back of headlight

[oneintohid]

Thanks, I'll follow this

[oneintohid]

Not much, I'm thinking to shave a little more off the edges to allow for left-right movement

[oneintohid]

Hi, I needed to make a cut to let the projectors sit back properly inside the housing. Now I need ideas on how to seal it up.

I'm thinking...