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Take them back to the shop you got them from, and see if they have any buckles in stock. If they don't you could try to get them to special order some, If FT have any. Or you could just try as many FT dealers as possible, hopefully someone will have some in stock.
From what I have read/talked to FT about/messed around with, it is not possible to fix just the spring on the buckles, so you are stuck with purchasing a whole new buckle.