The correct bearing tension in your steering head will dictate how well or badly your machine steers, if in doubt about how worn your bottom race may be why not put your mind at rest, and fit all new parts? It is just one area of your machine less to worry about. To ensure you order all the parts you need, maybe new ball bearings, and the top race components as well, check out the online 'parts list' fiche for your model, and save time and money on shipping costs with a multiple order.
Note: this part is superseded by 53212200305.