No idea if this is what you asked for. I'll plead In vino, veritas if it's not what you need and try again.
The nut, the white thing holding/guiding the strings at the headstock end. Looking at it from the side it is 3/8 (left to right) wide and 5/8 (top to bottom) tall. It's 1 1/2 wide, after changing perspective. Between the A and the D string it is 31 inches from the saddles, on the bridge, to the face closest to the bridge. It is 8 inches from that same edge to the highest/furthest point on the headstock.