I've tried so hard to search for this. I bought a chase bays extended clutch line but they don't even know what the thread size is or pitch on the male end going into the slave. I am running a T56 magnum transmission trying to adapt its 4an fitting to this line. So just need to know is this a 3 an or something different so I can order a coupler adapter to get then connected. I dont need to know the end going into the pedal part just the other end that I believe goes into slave cylinder. Thanks everyone. They do sell one to a t56 but I have a custom tilton setup so their e46 to t56 line kit doesn't work either for me.