14 5/8" (W) + (2) .615" mounting flanges 4 1/4 (L) 2 5/8" (H) head mount holes = 2.43" center point spacing on each side center point of flanges from side to side is 15 1/16"
Tweed combo mount holes are spaced 13.5" center to center
Transformer cutouts for: Mojo 756 and Mojo761