| Digit(s) | Category | Code | Description |
| Digit 1-3 | Make | ZFF | World Manufacturer Identifier: Italy, Ferrari, Ferrari |
| Digit 4 | Engine | A | | Engine type | F106B040 | | Related models | 308 GTBi/Si, Mondial 8 | | Remarks | US version |
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| Digit 5 | Safety System | A | 3-point inertia belts with auto retractors for front |
| Digit 6-7 | Model | 02 | 308 GTSi |
| Digit 8 | Market | A | Left-Hand Drive, North America |
| Digit 9 | Check Digit | 8 | The check digit is correct |
| Digit 10 | Model Year | A | 1980 |
| Digit 11 | Plant | 0 | Maranello |
| Digit 12-17 | Serialnumber | 031989 | Serialnumber 31989. The given number fits in the known ranges for this specific model. |