| Model Code | Description | |
|---|---|---|
| 01 | 385.523, 385.525, 385.528 | ELIMINATION OF RAPID AIR FEED SYSTEM USED FOR AIR SUSPENSION |
| 02 | 385.204, 385.207, 385.208, 385.209, 385.214, 385.217, 385.218, 385.219 | IN-LINE ENGINE |
| 03 | 383.222, 383.223, 383.225, 383.227, 383.228, 385.224, 385.227, 385.228, 385.229 | V-ENGINE |
| 04 | 385.523, 385.525, 385.528 | USED WITH AIR BRAKE |