I am in need (well, want) and will certainly contact Brian directly.
Windage adjustable sights are not absolutely necessary, but I'm very much in favor of them for any and all rifles for which they are available.
In the case of MILSURP rifles, such sights are not always original, of course, but I try to acquire them if they are.
Our local matches are for essentially unaltered MILSURP rifles, but we do shoot for both group size and score, and windage adjustment (and finely-adjustable elevation) make it much easier to keep things in the middle, given the vagaries of weather and different ammunition. In our latest match, I had the best score, but not the smallest group aggregate.
We are fortunate to have a very good range facility, but less-so in that it faces almost due South, so that the sun is usually in one's face, and crosses from left to right as the day progresses, which makes windage correction (by one means or another) VERY helpful for good scores - then, there is the wind, which is almost always present here among the mountains on all sides.
It's also true that my aging eyes do not accommodate well with open rear sights (I much prefer apertures), but the L-E combo is among the best such, and I can still manage. And, as I said, the L-E was and is an experiment with a rifle type I'm not well acquainted with, and the results so far are encouraging.
mhb - MIke