Rotary 728 3/8" x 3-3/16" IV39A V-Idler Pulley replaces these OEM part numbers:
| Bolens | 171-0567 |
| John Deere | AM103019 |
| John Deere | AM-32672 |
| Massey Ferguson | 1040-013-M1 |
| MTD | 756-0116 |
| MTD | 75604209 |
| MTD | 956-0116 |
| Oregon | 34-030 |
| Oregon | 78-019 |
| Prime Line | 7-05212 |
| Prime Line | 7-05214 |
| Prime Line | 7-05215 |
| Prime Line | 7-05477 |
| Stens | 280-127 |
| Stens | 280-188 |
| Stens | 280-248 |
| Stens | 280-263 |
| Stens | 280-271 |
| Sunbelt | B1SB728 |
| Toro | 3-4243 |
| Toro | 8205 |
| Walker | 7245-1 |