| Part Number | Description |
| 45373001 | CASSETTE: ASSY, B721dn, B731DN |
| 45366001 | CLUTCH, B721dn, B731DN |
| 45376501 | COVER: ASSY FRONT, B721dn, B731DN |
| 45378701 | COVER: ASSY STACKER, B721dn, B731DN |
| 45375101 | EJECT: ASSY, B721dn, B731DN |
| 45377801 | FEEDER: ASSY REGIST, B721dn, B731DN |
| 43895001 | Frame-Assy-Retard, B721dn, B731DN |
| 45379304 | FUSER: ASSY PN298 SPARE 120V, B721dn, B731DN |
| 45378401 | HOLDER: ASSY HEAD, B721dn, B731DN |
| 45371201 | MOTOR: DC (F), B721dn, B731DN |
| 45363001 | MOTOR: DC ID, B721dn, B731DN |
| 45488201 | MOTOR: FAN (60), B721dn, B731DN |
| 45488202 | MOTOR: FAN (60), B721dn, B731DN |
| 45102001 | PCB, B721dn, B731DN |
| 45098901 | POWER SUPPLY: HIGH VOLTAGE, B721dn, B731DN |
| 45280101 | POWER UNIT: ACDC SWITCH, B721dn, B731DN |
| 45379001 | TRAY: ASSY FRONT, B721dn, B731DN |
| 44901702 | UNIT: WIRELESS LAN (OKILAN 520W), B721dn, B731DN |
