Dixie gun works has them on their web page. I call, give them all my info, then they said they are sold out.
I may try a Williams, or a Lymann. I read a Lyman can pinch your hand during recoil. I can't see that, but maybe for a lefty? I am "building" a TC Hawken from some spare parts and one I got of the classifieds for a friends kid. They use a peep on a Marlin 22, so they are accustomed to the sight picture.