I'm trying to put the stock downpipe back on and have lost the stock bolts/nuts that connect the two stock downpipe pieces together. I still have one threaded stud on one side, but will need to purchase bolt/nut for the other side, as well as nuts for the threaded stud. Can anyone tell me what the thread size is for the bolts/nuts that connect the two downpipe pieces together? Any help is appreciated.