Grnamin there is a chain of stores up here in Canada called Mountain Equipment Co-op. They are a technical/high-end climbing, hiking, paddling supplier. I've seen similar pieces of hardware in their spare parts section (replacement buckles and etc if you happen to break one). Perhaps there is a store similar to MEC in your neck of the woods?
Hugh
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Scraped, burnt, sliced, smashed. AHHHH, knifemaking!!!!