| STEYR 2304K Bearing | 20 | 52 | 21 | STEYR | Self-aligning Ball Bearings | 
    | SKF NJ2304E Bearing | 20 | 52 | 21 | SKF | Cylindrical Roller Bearings | 
    | KOYO NU 2304 E Bearing | 20 | 52 | 21 | KOYO | Cylindrical Roller Bearings | 
    | SKF 2304 Bearing | 20 | 52 | 21 | SKF | Self-aligning Ball Bearings | 
    | NSK NJ2304+HJ2304 Bearing | 20 | 52 | 21 | NSK | Cylindrical Roller Bearings | 
    | NSK NU 2304 E Bearing | 20 | 52 | 21 | NSK | Cylindrical Roller Bearings | 
    | SKF 2304M Bearing | 20 | 52 | 21 | SKF | Self-aligning Ball Bearings | 
    | FAG NUP2304E.TVP2 Bearing | 20 | 52 | 21 | FAG | Cylindrical Roller Bearings | 
    | KOYO 2304 Bearing | 20 | 52 | 21 | KOYO | Self-aligning Ball Bearings | 
    | KOYO NU 2304 R Bearing | 20 | 52 | 21 | KOYO | Cylindrical Roller Bearings |