| Model Code | Description | |
|---|---|---|
| 01 | 421.130, 421.131 | SEE STANDARD VERSION |
| 02 | 421.122, 421.123 | ONE-CHAMBER BRAKE BOOSTER |
| 03 | 411.119 | ONE-CHAMBER BRAKE BOOSTER |
| 04 | 421.124, 421.125 | ONE-CHAMBER BRAKE BOOSTER |
| 05 | 421.132, 421.133 | SEE STANDARD VERSION |
| 06 | 411.119 | ONE-CHAMBER BRAKE BOOSTER |