Case 310 Transmission Nut

I'm looking for information on a case 310 transmission nut. The nut is behind a cover near the drive shaft. I have a 1967 or 69 310 that I'm trying to repair. The previous owner had the nut fall off and the threads are messed up. I would like to know where I could find the nut or the size and threads for the nut so I can get one made. The nut is part number CAS11380, my local dealer said it will fit the Case 350 also.



Thanks for the help

Case 310 Transmission Nut