Small needle roller bearing inside the input gear of 3- and 4-synchro remote and magic wand gearboxes. These are for the small mainshaft 14mm "snout" found in the A-series classic Mini gearboxes. Ref: CHM172, CHM0172, 88G409.
One if the weak links in the classic Mini transmission is this small bearing inside the 1st motion gear that rides the nose of the main shaft. When rebuilding, inspect to make sure that the nose of the mainshaft had not become worn.