Thanks for the bump Ken!
They are useful and hard to find. I also really like using it for a dark cloth holder and a lens shade on my big Linhof's. Those old Linhof's make a C1 look like a small camera!
Last summer I bought a C1 from KEH, a very good deal, but no included wire form. Not 2 weeks later they offered one with 4 of the wire dark cloth holders. I was so upset, I called KEH and asked, WHY?
Of course their reply was they sell in lots, as they come in.
I still buy and sell with KEH!