ORIGINAL: cayugad
Have you tried;
Muzzleloader Builders Supply
I have their catalog and they have a large selection of different sights in the catalog and on line. Since they deal in building rifles, they might be able to help you out Roundball. They are real nice people to deal with.
Thanks...I've checked with them and several of the established suppliers...nada...thought I'd post on message boards in case somebody might have or know where some are