Quick favour

Can someone measure the width and height of the hole in the diffuser for the exhaust tips?

Cant find my torch so cant see well enough to get down the garden to the Cup to measure it myself ;/
 
lmao, lame as it may sound its true. I cant see jack shit down there this time of night! Having to install 3 lights in the garden so I can park up at night and safely walk up the garden