Spark plug · Autolite
Equivalents for the Autolite spark plug A21X
Autolite A21X is an automotive spark plug. Compare its 245 equivalents and find the cheapest compatible plug: NGK, Bosch, Champion, Denso and more.
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What can replace a Autolite A21X spark plug?
The Autolite A21X is interchangeable with: Bosch W2A, Champion J2, Denso W31S, Bosch W5E, Bosch W8F, Bosch W9F. These spark plugs share the same mounting (thread, seat) and heat range.
Cross-references and specifications are provided for guidance only. The wrench size can vary by brand, and some data is inferred from the plug code or an equivalent reference. Always check the vehicle manufacturer's recommendation before buying and fitting.