Change the optical plastic lens on Lomo Belair 6x12 lenses

Good day everyone!

New here! I need expert advice and figured this would be the best place.

I recently bought myself a Lomography Belair 6x12 medium format camera. More info about the camera here https://microsites.lomography.com/belair/

And I screwed up royally!

The lenses don't have any threads to screw on filters. I wanted to be able to screw on ND filters for long exposures and I decided to glue step-up rings to the lenses with some Gorilla glue.

Big mistake. I guess the fume of the glue reacted with the plastic optical element and I completely messed up my lenses!

See picture attached

I wonder where I could find a replacement glass for those 2 optical elements. The lenses are new. I just need to screw them back together... I found www.surplusshed.com, but I have to research specific lenses and I have no idea what I need to search.

Here's a link to the details of the lenses: https://microsites.lomography.com/belair/lenses/

I have the 90mm Standard Lens and the 58mm Ultra-wide-angle Lens.

Can anyone help me?

Thanks a ton in advance...

Those elements will have been designed specifically for those lenses. You won't be able to buy off-the-shelf replacement elements. Best bet would be to look for a used lens of the same type or contact the manufacturer to see if they can supply replacements.