Well, if you can make one as a master, and glue it to a piece of styrene sheet, you could take epoxy putty and press it over the master to create a mold. Dust the putty and the master with talcum powder first, so they don't stick. Carefully remove the putty before it hardens. I'd suggest a soft epoxy putty like White Milliputt, rather than the harder, chewing gum-type putties that come in a ribbon.
Then you can dust the hardened mold with talcum and press balls of epoxy putty into it to create copies in an assembly line process. Once they harden, you can cut or saw the buckles off the blobs of epoxy.
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This is what I mean:
I tried using PE for these, but it just doesn't work for me. Is there anything else that could be used, an aftermarket product or something in 1/35 scale? I need about 10 of these, so making each of sheet styrene could be a bit of an undertaking.
Cheers,
Mario