Outer support bearing for the first motion shaft. Comes with bearing and outer race. You MUST REPLACE the outer race when using the new bearing. An easy way to remove the old race is to clean the housing very well, remove the circlip, and place the whole housing in the oven at 300 degrees for 10 minutes. Upon removal, slam the housing, engine side down, onto a flat piece of wood and the race should fall out. This is also a good time to install the new outer race. You can freeze the new race to make it that much easier.