Questions? Looking for parts? Parts for sale? or just for a chat,
The WD Motorcycle forum
Cornucopia have NOS quadrants on their site (https://www.cornucopia-enterprises.de/). This doesn't always mean they have stock: best to email and ask.
None available at Cornucopia unfortunately.
email (option): Zac66_826@hotmail.com
De Groot? They're listing 'em too. (http://degroot.bsa.nl/)