Okay, I made a scan with a ruler, and here's my measurements...
1 7/8" / 4.8CM tall
1 21/32" / 4.2CM wide
Plastic is 3mm thick
The inner hole is 5mm from the left edge, 32mm from the right, 6mm from the top, and 6mm from the bottom. The outer hole / lip around inner hole is 1mm around the inner hole and cut about 1mm into the plastic.
The notch starts at 37mm from the bottom right corner of the plastic, and is a 45 degree angle cut across to 42mm from the top.