I can get the small semicircular ones easily, but the obvious option was to try getting them from Albion but both saddlers I have tried say I've not got much hope....
My fault I left them on a saddle which had been at the local shop to sell, when I went to check it was still there the guards had gone!
i'd call Albion direct. pretty rubbish customer service if they won't supply something so minor but so essential, i think.
if they give you any rubbish, ask to speak to Sherry about it.