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Here's a set of six iridium spark plugs that cross-reference to a ton of common applications, including the Motorcraft SP550 and SP550X.

These are a great upgrade for many Ford, Lincoln, Cadillac, and Land Rover vehicles.

Iridium is a really hard material, so these plugs are built to last a long time and provide a strong, consistent spark.
The manufacturer part number is QH6RTIS, and they cross to OE numbers like AYSF22FM and AZFS32FE.

They're standard configuration, gas-engine plugs made right here in the USA.




5 out of 5