The spare part with the original number B4021 ALOIS HIEBLE – Spark Plug, is intended to replace the factory component of vehicles and is selected by OEM code. Relying on the original number lets you verify compatibility with precision, regardless of the manufacturer or part type - be it brake pads, a filter, a belt, a sensor, or any other component. Choosing by OEM remains the most reliable way to avoid mistakes and ensure the assembly operates correctly after installation. For OEM B4021, there are alternatives from multiple manufacturers. Among the most popular replacements are :

• NGK:3510
• ASHIKA:MA-40020
• JAPKO:MJ40020
• JAPANPARTS:MM-40020

This makes it easy to choose a part based on brand, price, and availability. The breadth of options allows you to pick the required quality level - from premium brands to budget-friendly solutions. Each alternative has its own technical characteristics, yet all of them are cross-referenced to the OEM B4021 , guaranteeing compatibility with the original part. A catalog this comprehensive streamlines selection and helps you quickly find the optimal option for your technical requirements, preferred manufacturers, and budget. All information is grounded in OEM matching; therefore, choosing a part by number B4021 ALOIS HIEBLE – Spark Plug ensures accuracy and reliability in any situation.