| 001 | Rear panel connectors instead of front |
| 002 | High stability Internal Reference |
| 003 | Connections for Ext. local Osc |
| 004 | Operation from 48hz to 440Hz Power Line |
| 021 | Add HP 11722A Sensor Module |
| 030 | High Selectivity |
| 032 | 12.5 kHz adjacent channel filter |
| 033 | 25.0 kHz adjacent channel filter |
| 035 | 30 kHz (Cellular Radio) Alternate Channel Filter |
| 036 | |
| 037 | Carrier Noise Filter |
| 907 | Front handle kit |
| 908 | Rack Flange Kit for Use without Handles |
| 909 | Front Handle & Rack Flange Kit |
| 910 | Additional operating and service manual |
| 915 | Additional Service Manual |
| ABJ | Japan Quick Users Guide (Japanese localization) |
| H45 | Modify FM Descriminator to FAS |
| RMKT | Agilent Refurbished Product (Do Not Use - Certiprime Option) |
| UK6 | Commercial calibration with test results data |