Hole for silicon themo prob

[lemans]

I am going to order the silicon grommet for the thermometer probe from Weber for my 22.5 WSM
But does anyone know what size hole I have to drill?

 

[lemans]

Ok so I found out it is a 1 1/4 inch hole. Some member who has a 22 WSM can you please measure how far down from the top of the center section and on which side does it go?
Thank you