Why order them when you can make your own from plummers epoxy. They would be custom fit also. It takes plummers epoxy about a hour to harden to full strength if that. You could make about probably fifty of them from one tube of $5 putty. It hasz the consistency of playdoe but hardens fast. At the transition state you could trim the edges and what not. ALso it would be non conductive so there would be no heat transfer as you see with copper shims.