Well, I don't know about that. My orig trans was swapped out before I got the car so I can't say what was put in but I can't imagine someone going to all the trouble to install the wrong replacement in the early 70s when they were so easy to get. And then having to change the speedo cable to a longer one to reach all the way to the other side. It really seems like the speedo cable would get in the way of the shifting assembly on the drvr side. I have the fresh built M20 sitting on the shelf in the garage. I'll get the number off the tail housing. Maybe I can cross ref to see what the app was. Maybe it was the Sag boxes that had the speedo on the drvr side?