Hello every one im a new user to this ! And i currently own a 94 chevy impala ss that i plan to make a rebuilding project out of it starting off with the engine. Have noticed that it runs hot in traffic when i bought it about a month ago. So i replaced my primery fan motor which was out and i have also replaced the stock intake with a k&n intake and know i have bought a new fan switch from jetts performance which will cause my fans to turn on at a lower temperature but for installation its asking me to take off the water jacket plug inbetween the 1st and 3rd spark plug know that water jacket plug takes a 5/16" square male insert driver to take out the plug does anyone know where i can get a tool for that or what i can use for it. Thank you!