Here are the measurements as best as I can make in my shop:
Measurements (made at trunion):
Width: 1.614" / 41mm
Height: 1.889" / 48mm (trunion height - should be internal height of receiver)
Length: 14" / 355.6mm
Thickness of material appears to be 1.6mm (.064") at top groove in trunion.
Anyone have other numbers to post?