Yellowing sidelight lenses?

Hi all,
On my 110, I have military lights, where the lens can be unscrewed to change a bulb rather than having the standard lens with two screws that are always rusted in.

My two front sidelight lenses have gone very yellow, and I was wondering if there was anywhere I could get a new replacement, or a different type (LED?) that would still look the same?
Any ideas?

Thanks
Tom

Try cleaning them with toothpaste. It works on headlights.

. . . . and teeth

Those of us wiv normal lights puts a spot o grease on the screws to stop em rustin