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Product details
Part NameSpark Plug Boot Kit
BrandWalker Products
Part Number900-5041
UPC00724620108440
Estimate Delivery Date
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If your vehicle is listed on the fitment table below, the product will fit your car - we guarantee it. All you need to do is to ensure that the vehicle's Year, Make, Model, Trim, and any other notes specified inside the fitment table are respected.
Walker Products Spark Plug Boot Kits are professional-grade OE Replacement solutions designed to restore the integrity of the ignition system by replacing worn or damaged spark plug boots. Over time, boots can become brittle, cracked, or oil-soaked—leading to poor insulation, misfires, and ignition failure. These kits include premium-grade boots, insulators, and spring terminals built to match OE specifications for fit, dielectric strength, and thermal resistance. Each component is manufactured using high-quality materials engineered to withstand the high-voltage environment of modern ignition systems, along with the heat, vibration, and chemical exposure found in today’s engine bays. With exact OE fitment and factory-style geometry, installation is quick and secure—no trimming or modification required. Ideal for maintenance, tune-ups, or coil-on-plug repairs, Walker Spark Plug Boot Kits restore spark delivery, protect against arc-through or voltage loss, and support consistent engine performance, fuel economy, and emissions control.
Characteristics include:
Restores Ignition Seal Integrity: Replaces worn or damaged spark plug boots to maintain proper coil-to-plug connection and prevent misfires.
Improves Ignition Performance: Helps restore voltage insulation and spark delivery, supporting smooth idle, acceleration, and fuel efficiency.
OE Replacement Construction: Manufactured to match OE materials, dielectric strength, and thermal resistance for long-lasting reliability.
Heat & Vibration Resistant: Designed to withstand extreme engine temperatures, vibration, and exposure to oil or fuel vapors.
Exact OE Fit: Engineered for 100% OE fit with factory-style dimensions for easy installation without modifications.
Some of the interchangeable part numbers are:
5421BK | 584009
Customer Video Reviews
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Fitment Table
This product is compatible with these vehicles:
Year
Make
Model
Notes
Position
2005
Mazda
Miata
1.8L
Inline engine
4 cylinders
3.27" bore
3.35" stroke
Naturally Aspirated
2 COP Boots Req'd
2004
Mazda
Miata
1.8L
Inline engine
4 cylinders
3.27" bore
3.35" stroke
Naturally Aspirated
2 COP Boots Req'd
2003
Mazda
Miata
1.8L
Inline engine
4 cylinders
3.27" bore
3.35" stroke
2 COP Boots Req'd
2002
Mazda
Miata
1.8L
Inline engine
4 cylinders
3.27" bore
3.35" stroke
2 COP Boots Req'd
2001
Mazda
Miata
1.8L
Inline engine
4 cylinders
3.27" bore
3.35" stroke
2 COP Boots Req'd
See what other customers say:
Customer Reviews
Overall rating: 4.9 / 5 from 594 reviews.
I love PartsPioneer. The rear-wheel Positive Plus pads and Genius rotors fit perfectly on my 2019 Subaru Forester. Excellent quality at a fair price. Highly recommended.
Thanks for catching an error in my order and righting it for me, complete with email to say so! This … is what customer service head and shoulders above, looks like !! Well done all !!
Service was great, appreciated the phone call to confirm the vehicle. Parts arrived quick. OEM fit. Will be ordering brakes as you can see by the picture. Very impressed.
I have bought this rotor on part pioneer for my Q3 and installed and used for over a week, they are amazing no squeaks no noises brakes have improved 110%. This rotors are the best so far I’ve always bought rotors and used in all three of my cars and so far these ones are the best that I have ever bought.
Thanks
Renato
Awesome parts, for a great deal, and the customer service is second to none, always willing to help, and they double check fitment to ensure you always get the right parts! Will definitely be ordering again.