Schlage only offers one option to replace the outside lever/knob. Schlage recommends replacing the entire lever/knob+rose or lever/knob+escutcheon assembly. Those part numbers are:
09-506 - outside lever/knob + A, B, or C rose assembly.
09-655 - outside lever/knob + Avanti or Merano Rose assembly.
09-550 - outside lever/knob + blank escutcheon (L or N) assembly.
09-551 - outside lever/knob + emergency turn escutcheon (L or N) assembly.
09-552 - outside lever/knob + concealed cylinder escutcheon (L only) assembly.
09-553 - outside lever/knob + full face cylinder escutcheon (L or N) assembly.
09-556 - outside lever/knob + cointurn (L or N) assembly.
Replacing the outside lever/knob only with part number 09-401 was possible, but very difficult. A truarc retaining ring holds the lever to the bushing/rose. Removing this retaining ring is not easy and the ring can sustain damage which prevents it from being reused. A new clip and install tool are included with this item.
Note: As of October 2025, the 09-401 is no longer available from Schlage as a replacement part. It may still be available from Commercial hardware suppliers.
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