| Description | Part Number |
| MS331dn Enterprise mono laser printer | 29S0000 |
| 250-sheet tray | 41X2585 |
| 550-sheet tray | 41X2612 |
| 550-sheet tray insert | 41X2613 |
| 550-sheet tray pick roller | 41X2614 |
| Controller board (MS331) | 41X2655 |
| Duplex guide | 41X2712 |
| Front door with MPF pick roller | 41X2584 |
| Fuser, 115V | 41X2586 |
| Fuser, 230V | 41X2600 |
| HVPS | 41X2592 |
| Left cover | 41X2579 |
| Left front door link | 41X2578 |
| LVPS, 60W and 120V | 41X2588 |
| LVPS, 60W and 230V | 41X2589 |
| Main drive gears kit | 41X2576 |
| Main fan | 41X2636 |
| Pick roller clutch | 41X2391 |
| Pick separator roller | 41X2575 |
| Printhead | 41X2573 |
| Rear door | 41X2582 |
| Right cover | 41X2580 |
| Top cover with control panel | 41X2581 |
| Transfer roller, bearing, and spring | 41X2587 |
| Upper front cover with decals | 41X2583 |
