| 5851-2583 | EIO slot cover - Installs on formatter boards without JetDirect PCA |
| 5021-0349 | EIO slot cover - Installs on formatter boards without JetDirect PCA |
| RB1-8788-000CN | Tray 1 sensor arm cover - Tray 1 paper sensor actuator arm and cover |
| RB1-8805-000CN | Rear fuser cover panel |
| RB1-8706-000CN | Main cooling fan cover |
| RB1-8710-000CN | Plate cover for HP LaserJet 4000 Series |
| C4232-60101 | Dust cover - For use with models featuring a standard 1X500 paper tray |
| C4232A | Dust Cover - Used on Models With Standard 1X500 Paper Tray |
| C4233-60101 | Dust cover - For use with models featuring standard 2X250 paper trays |
| C4233A | Dust Cover - Used on Models With Standard 2X250 Paper Trays |
| C4234-60101 | Dust cover - For use with optional 500-sheet feeder on LJ4000/4050/4100 models using 1X500 or 2X250 paper trays |
| C4234A | Dust cover - For use with optional 500-sheet feeder on LJ4000/4050/4100 models using 1X500 or 2X250 paper trays |
| RB1-8907-000CN | Feeder control PCA cover |
| RB1-8858-000CN | Formatter board cover panel |
| RF5-1876-000CN | Left side duplexer cover - With connector |
| RB1-9044-000CN | Top cover - Duplexer access top cover |
| RB1-9045-000CN | Duplexer rear cover panel |
| RB1-9047-000CN | Right side duplexer cover |
| RG5-2663-040CN | Top Cover Assembly - Does Not Include Control Panel |
| RG5-2663-090CN | Plate cover for HP LaserJet 4100 Series |
| RG5-2664-070CN | Right front cover assembly - Mounts bedie the formatter panel |
| RG5-2665-000CN | Left side cover assembly - Includes panel retainer clip |
| RG5-2677-000CN | Upper right cover assembly |
| RG5-2678-000CN | Upper left cover assembly |
| RG5-2679-000CN | Right lower side feeder cover assembly |
| RG5-2680-000CN | Left lower feeder cover assembly |