Try Doc White at his website
http://www.whitemuzzleloading.com/. I have dealt with him by e-mail in the past and often see his stuff for sale on gunbroker. He probably could make one if he does not have a spare one around.
[email protected]
Also, I ordered some stuff from whoever had whiterifles remaining stock, steve at
[email protected]. That was a couple years ago. Can also try the e-mail address shown on the
http://www.whiterifles.com/ page.