Rav Soloveitchik and Rabbi Yosef Eliyahu Henkin paskened that a 40 inch high mechitzah is kosher l’chatchila.
This is what I quoted. This is what I DO NOT BELIEVE and I see no reason in that footnote to change my belief. It is certainly possible that they permit such a mechitza in a shas d’ chak. What I absolutely do not believe is that they permit it l’chatchila as in the above quote from another post.