Hi Lars,
I can’t help. However there is a guy here in the Southern Cape who makes new lenses.
I could get his contact details and he might be able to reproduce the plastic bits. Once you have them you could destroy your lenses and chrome the frames and combine the new with the old.
Let me know if you are interested and I’ll get his details, price, etc
Regards
Chris
Cape Town
cfm65@me.com