2-3/4 X 3-3/4
| Model Num | Application | Cylinder | Serial Num | Bore | Rod | Code |
| 416C | BACKHOE BUCKET | 1668140 | 1XR2250-UP; 5YN16590-UP | 3.75 | 2.75 | I-UB-10 |
| 416C | BACKHOE EXT BUCKET | 1668141 | 1XR2250-UP; 5YN16590-UP | 3.75 | 2.75 | I-UB-10 |
| 428C | BACKHOE BUCKET | 1268312 | - | 3.75 | 2.75 | I-UB-10 |
| 438C | BACKHOE BUCKET | 6E3693 | - | 3.75 | 2.75 | I-UB-10 |
Caterpillar, CTC1361990
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