Fitment - Ignition coil module for series engines including FH430, FH500V, FH531, FH541V, FH580V, FH601V, FH641V, FH680V, FH721V, FH601D, FH641D, FH680D, FH721D. Function - Replacing the ignition coil enables faster engine starting and smoother operation. Improves engine operating efficiency and electrical performance, providing better recovery and response. Directly replaces old or damaged ignition coils to restore normal engine function. Quality - The ignition coil module is constructed from high-quality materials, offering long service life, wear resistance, and no deformation. Designed carefully and rigorously tested before shipment to ensure product reliability and performance. Installation - Replace the ignition coil at low cost compared to engine replacement. Operates reliably under all engine conditions and increases ignition energy for quick start-up. Manufacturer Part Number: 21171-7024, 21171-7026, 21171-7034, 21171-7037 Replaces Part Number: 21171-7001, 21171-7006, 21171-7007, 21171-7013, 21171-7018, 21171-7022, 21171-7024, 21171-7026, 21171-7034, 21171-7037, AM121820 Color: Black + Silver Material: Metal + ABS Package Contents: 2 x Ignition Coil Note: Light reflection and different displays may cause the color of the item in the picture to vary slightly from the real thing. Measurement may vary by +/- 1-3 cm.