Unfortunately, those links aren't going to help the OP find what he's looking for, unless maybe contacting them will reveal something I couldn't find. While they are all retailers of kilt belt buckles, none of them come with the wire for hooking onto the buckle. The kilt belts come with that already attached and so it doesn't come with the buckles. I, too, would be interested in knowing where to get those as I'd like to get into kilt belt making myself.
Gary, I appreciate the links, but I'd be very interested in seeing the kilt belts and sporrans you made. That's what I'm looking to make myself.