Type of socket used on tensioner bar

Hi, I have this vehicle and trying to replace the A/C compressor. I observed the "star E-14 socket" needed to remove the hoses from the compressor and bought that particular socket. When I lifted the car to get access to the compressor I noticed different Star socket sizes and would like to know what size or type socket is needed to manipulate the tensioner and remove the belt from the compressor? Thank you.