I have just rebuilt 3 synchro gearbox with O/D for my 64 3 main bearing engine. Missing is 1 key part, what Moss calls the Arm Assembly, interlocking, which for the NON O/D gearbox is part 461-230. This part does not fit the O/D box, and I can't find any reference to the correct part #, to search for the part. Does anyone know a part #, or what part might fit this application?