No idea how they came out. They were missing when I brought the bike.
Seems like it liked shedding bits, as it had also lost its entire seat lock
P&H told me they don't sell them as kits, just individually at the silly price...
Even the bloke on the other end of the phone was laughing at the price.
If no one else seems to supply these I think I'll see if I can get something similar in stainless from my local fastener supplier.