I can't really help you with your quest to fit dust seals, but I do know that David Silver Spares has the OEM boots for about $18 USD each, listed as Fork Gaitors. I put a set on my K1 about two years ago and they're still in great condition. No reason to think they won't last another ten years, at least. Don't worry about the shipping from DSS, they usually charge about the same or even less than what most domestic suppliers tend to charge.