I want to say it was a 14 or 16….. I might be wrong but I feel like I was using those two a ton in my build. I can check for you tomorrow if no one else knows.Quick question, what size wrench / socket are the torque converter bolts attaching it to the flex plate. Not diameter and pitch... Trying to see if a flex head wrench will get on them. None on the locked up engine currently line up with the access hole.