Anyone with a screw cutting lathe can make you a set. I had a friend in Saint John N.B. that made me a few about 20 years ago and also bought a bunch from a guy in Ontario that had them made in Montreal. My friend in SJ has since past away and I don't know what he did with the lathe.
Any machine shop should be able to turn out a few. If they are made from an original they are an excate copy. I used to sell them for $5.00 a pc and had no problem selling them at gun shows.
Don't have any for sale, figure I'll keep what I got left.