Rear '00 Mustang Tail Light Nuts
 

I am just wondering if anyone out there can help me with this. I just bought a chaser kit for my tail lights, but it's proven to be a real paint to remove the rear tail lights. I don't have any sockets deep enough to find out what size nuts these use to hold the light assembly on, so I wanted to know if someone could point me in the right direction. I plan on going out to buy it since using a pair of pliers is really killing my enjoyment of working on my car.

edit: Anyone at all? I don't mind having to buy a full set, but does anyone know atleast if it's SAE or Metric? Thanks in advance.