| Description | Part Number |
| 128MB DDR DRAM DIMM | 40X5937 |
| 256MB DDR DRAM DIMM | 40X5938 |
| 512MB DDR DRAM DIMM | 40X5939 |
| 64MB Flash Card | 40X1455 |
| Drawer 550-Sheet Drawer (complete), C546dtn only | 40X1538 |
| Drawer 550-Sheet Duo Drawer with 100-Sheet MPF C546, X546 | 40X2284 |
| 100-Sheet MPF tray only for 550-Sheet Duo Drawer C546 X546 | 40X2285 |
| Fuser drive motor | 40X5415 |
| Fuser exit sensor | 40X5413 |
| Fuser Maintenance kit, C54x, X54x, 110-120V | 40X2254 |
| Fuser Maintenance kit, C54x, X54x, 220-240V | 40X2255 |
| Fuser, 110-120V | 40X5406 |
| Fuser, 220-240V | 40X5407 |
| High-voltage power supply | 40X5405 |
| Image transfer unit (ITU) | 40X5403 |
| ITU paper path thermistor | 40X5429 |
| Lower left frame and lower right frame w/ cable cover | 40X5422 |
| Low-voltage power supply (universal p/s) | 40X5409 |
| Main drive gear with motors | 40X5412 |
| MPF latch cover 550-Sheet , C546, X546 | 40X2512 |
| Photo sensor (one per package) | 40X5426 |
| Pick tires | 40X5168 |
| Power cord; 2.5 m, 8 ft. Straight, UK, Ireland, Hong Kong | 40X0271 |
| Printhead | 40X5411 |
| Redrive | 40X6408 |
| Toner cartridge contacts (Pogo pin) | 40X5421 |
| Toner density sensors, left or right(one in package) | 40X5414 |
| Toner meter cycle card | 40X5404 |
| USB cable, packaged (2 m) | 40X1368 |
