Twin headlight lenses?

[proximity]

Hi, i have a set of twin spotlights for my bike. I was trying to polish the inside so that they would shine better but i dropped a lense and it cracked.
Any way i can get a new lense for this? I dont know where to find one and i would rather not pay 60 quid for a new set of lights.

The ones i have look like this:
https://www.demon-tweeks.co.uk/resources/images/detail/BIKHLUTR.jpg
I think they are the same ones sold all over.

If i cant get a replacement can it be fixed? Like i know they can somehow fix car windscreens with some kind of resin.
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2004 Aprilia Tuono