In reply to Stuart the postie: I've got some spares for Charlet M10s but doubt the spacing of the mounting holes is the same.
The best source of such things is Needlesport (in fact First Ascent, the UK distributor says as much on their website -
http://www.firstascent.co.uk/brands/black-diamond/black-diamond-maintenance... ). Therefore, if you haven't already done so, I would suggest giving them a call and see if they can order you some.