K 421/2 Air filter severe usage conditions
| ALCO | MD8052 |
| BOSCH | 1457433597 |
| CHAMPION | U795 |
| DELPHI | AF20107 |
| FILTRON | AP0513, AP0514 |
| GENERAL MOTORS (GM) | 24443113, 55556465, 91181912, 9201158 |
| HENGST | E611L |
| M-Filter | MAP60147 |
| MAHLE | LX1683 |
| MANN+HUMMEL | C301261, C301302 |
| MFILTER | K421, K4212 |
| OPEL | 835632, 93181912 |
| SCHUPP / SF FILTER | PA76206 |
| SOFIMA | S3214A, S3258A |
| U.F.I. | 3021400, 3025800 |
| WIX (EUROPE) | WA9402 |
