I think we have now established that Lancia did NOT have the option for green carpets when new.
All original Lancia Fulvia carpets that are now green were originally black and have turned green over time, some quicker than others, Fact.
All Fulvias that have green carpets retro fitted because the owner thought this was original are wrong.
Owners that have original fitted carpets that have turned green still are original, this is called authentic.
All interior panels were available in green (seats, door panels, interior panels) except carpets which were only available in:
grey (1900836)
beige (1900837)
blue (1900838)
red (19000839)
dark grey (1826211)
NOT GREEN.