I was able to buy a wreck of a Z1B in Ghent. It looks like a Z1000 but it's a '75 Z1B.
There's a lot of work to be done to make it shine again but nothing i can't handle.
See for yourself.
Don't get frightened, the pictures won't affect your bikes!
As you can see there's a lot of work to be done.

a cooling fin snapped off sometime in the past.

the seat lock is "original" as all the other parts on the bike.

just look at this product of the Belgian cottage industry, a very safe way to secure a duck tail

who the f**k needs a fuse when the loom is in such a perfect condition?

So this is what i've bought. It's not perfect but with a lot of elbow grease , work, time, effort and money she'll be a nice bike once again.
Just be warned: if you don't have any experience on restoring bikes: DON'T BUY THIS !!!
Greetings from Belgium
Philippe