Thanks, good to know that the seal replacement should have solved the problem completely.
Besides L+R there is also a difference depending if you have an early or late MG. Well described on the competitor forum : https://mgfregister.org/forum/viewtopic.php?t=25554
But I am also interested if the driveshaft should have a tight fit at the gearbox-entry, or is it possible to have some radial play, being able to jiggle it a bit. So if anyone has the MG on the ramp, a quick check would be much appreciated.