Thanks for that, I see they have been coming back online over the last week or so, more expensive than I remember though!
Just checked.
About double actually..
Printable View
Also worth a mention is that the shoes wear through the backing plate to the point that the springs lose tension.
I have welded up and ground flat the backing plate a few times with a fair amount of success, though it would be nice if I could have handed it in somewhere that could also harden it.