| 1000450457 | LNG Natural Gas Engine Spark Plug | Delong F3000, New M3000, X3000 | Weichai WP10NG / WP12, double iridium, Bosch FR3KII332, Euro V |
| 1003373173 | Natural Gas Engine Double Iridium Spark Plug | Delong X3000, X5000 | Weichai WP13 / WP15 / WP17 CNG, double iridium, FR3K11332, Euro VI |
| 610800190174 | Natural Gas Engine Spark Plug (Bosch) | Delong, Aolong, Bus Series | Weichai WP7 / WP10 / WP12 NG, Bosch, M14×1.25 |
| 612600190535 | Torch Spark Plug (Standard) | Delong F2000, F3000 | Weichai WP10NG.260, Torch brand, 50,000km life |
| IFR7F-4D (NGK 5115) | NGK Iridium Spark Plug for CNG/LNG | Delong, HOWO, Yuchai | NGK OEM, M14×1.25, 19mm reach, heat range 7, iridium |
| PFR7B4D (NGK) | NGK Laser Platinum Spark Plug | Weichai Natural Gas Engine | NGK laser platinum, M14×1.25, 19mm thread |
| 202V25923-0005 | MAN MT13 Natural Gas Spark Plug | Shacman (MAN Engine), Sitrak | MAN MT13, Euro VI, iridium, high temp resistant |
| FR3KII332 | Bosch Double Iridium Spark Plug | Delong (Weichai WP13 CNG/LNG) | Bosch OEM, double iridium, cross ref: 1000450457 |