Hi.
Literally just gone through exactly the same thing myself and, due to the rubbish design of the ones on the Fazer, they can't be replaced by any pattern ones.
Also, Yamaha won't sell them on their own - you have to buy a complete fork leg lower with them fitted.
I was really lucky in that I managed to buy a working pair on FleaBay that had been removed from a crash damaged bike with only 9k miles on the clock, thanks to another eagle eyed Foccer.
Only one of my originals had seized so I did keep the other one that was still working so, if you can only find one, you're welcome to it if you cover the postage.
Gotta keep those Fazers as good as possible!!