I know of a Lyman 20 MJT front sight, but thought it would be too big a diameter to match a nice rear peep.

My 39a has 17A front matched to a Williams FP rear sight with an .050 aperture. Thinking about it, I'll probably just duplicate it to keep all the sight pictures the same. Can't wait to get my hands on it (10 day wait here in California).

Now to get my hands on a new bullet mold (Lyman 311041) and work up some loads!