| Fabricante | Referencia |
|---|---|
| SKF | NUP304-EC P (SKF) |
| Steyr-Daimler-Puch | 0059819701 |
| NTN | NUP304 |
| Steyr-Daimler-Puch | NUP304E/TGP1 |
| RIV Officine di Villar Perosa | 5DBVZ20 |
| Steyr-Daimler-Puch | NUP304 |
| Fischer Bearings | NUPM20 |
| SKC | 5972559 |
| GPZ Bearings | 92304 |
| RHP | NUP304 |
| KOYO | NUP304 |
| Liebherr | 274254602 |
| SKC | 8140089 |
| NSK | NUP304 |
| SKF | NUP304 |
