| Model | Engine | Year | Standard Plug | Gap (mm) | Iridium Power | Iridium Tough |
|---|---|---|---|---|---|---|
| Buda LO525 | Â | W20SU | 0.9 | |||
| Hall Scott 400, 935, 1091 | Â | M17 | 0.6 | |||
| Hall Scott 590 | Â | W20SU | 0.9 | |||
| International RD450, RD451 | Â | W20SU | 0.9 | |||
| Le Roi H540 | Â | W20SU | 0.9 | |||
| Waukesha 6MZR | Â | M17 | 0.6 | |||
| Waukesha 140GKB, 140GZB, 145GKB, 145GZB | Â | W16LS | 0.6 |