What diameter hole for the battery drain in the fender apron 70 cuda

[gtxno1]

Hi everyone I am getting the body work squared away on my 70 Cuda I am making a patch on the apron where the battery tray bolts down I need the hole diameter for the battery tray drain because mine is rotted do not know the diameter thanks

 

[340challconvert]

Looks to be a 7/8 " hole on the shelf

 

[gtxno1]

Thank you