The sicha where the Rebbe discussed the shape of the Menorah is printed in Likkutei Sichos Chelek 21 Parshas Terumah, Sicha Gimmel, page 164. Anyone with someone basic Jewish literacy and Yiddish language can read and understand it, instead of aimlessly posting on this forum.
Most of the questions asked here were answered in that Sicha long ago. If you open it up, who knows? Maybe you’ll even learn something new.