Man that's a tough nut.
For sure keep searching your boxes.
There are numerous vintage scooter groups on Socials. On FB there is a SS180 owners group. You could make a "wanted" post there or on any of the various vintage scooter groups. there is also scootnet2 Classifieds:
https://www.scootnet2.net/
Watch for scammers, and be prepared to open your wallet. They are not re-popped, so they are not cheap when/if they do show up.