In reply to Richard Carter:
>"Local bike shop had never seen them before"
Shocking! Ye need an olde worldy bike shop that's likely to have a drawer full of them.
If you'd posted yesterday, I'd probably been able to find one in a tin of bits I've got in my mum's garage... Might be a while before I'm out that way again - I'm a bad son.
Is it for the back (round curve) or front (oval curve)?