Are these ngk 3521 cr9eix iridium ix spark plugs?

These are correct and they perform flawlessly! Ron

Will these fit a 2019 polaris rzr turbo s

To be safe: check with dealer or a cross reference app to be sure. Ron

Will this work on my Harley Davidson 2018 street glide special?

I have a 2017 Road King with the Milwaukee 8 and this is the one it calls for.

Are these the right iridium plugs for an Indian scout 60?

NGK has multiple grades of plugs that may fit your engine. It is recommended to go to NGK site at https://ngksparkplugs.com/en/part-finder to verify the applications that will fit your engine. This site will show you all of the available plugs to fit your engine and will also show you which grade plug is recommended for the best performance of your specific engine.

NGK CR9EIX - Iridium IX Spark Plug - 4-Pack/--

NGK CR9EIX - Iridium IX Spark Plug - 4-Pack/--

Product ID: 471862111

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Details

Brand
NGK
Core Material
Iridium
Thread Size
10mm
Top Material Type
Iridium
Vehicle Service Type
Car

⚡Iridium core for superior ignition

📦4-pack value bundle

🔧Direct OEM replacement fit

Description

⚡ Ignite your drive with NGK’s elite spark plugs—because every start counts!

DURABILITY THAT LASTS - Engineered for extended lifespan and consistent performance
PRECISION IGNITION POWER - Iridium tip ensures faster, more reliable starts every time
VALUE PACKED CONVENIENCE - Four spark plugs in one package—ready to upgrade your ride
TRUSTED QUALITY ASSURANCE - Backed by NGK’s 4.8-star rating and genuine manufacturing
SEAMLESS OEM COMPATIBILITY - Exact fit for your vehicle, no modifications needed

The NGK CR9EIX Iridium IX Spark Plug 4-pack offers professional-grade ignition performance with a durable iridium core, ensuring reliable starts and long-lasting engine efficiency. Designed as a direct OEM replacement, these spark plugs fit seamlessly into compatible vehicles, delivering trusted NGK quality backed by excellent customer reviews.

Specifications

ASIN	B004SKYAWM
Brand	NGK
Brand Name	NGK
Compatible with Vehicle Type	Car
Core Material	Iridium
Country of Origin	Hong Kong
Customer Reviews	4.8 out of 5 stars 487 Reviews
Item Weight	0.28 Pounds
Manufacturer	NGK
Manufacturer Part Number	CR9EIX
Model	3521
OEM Equivalent Part Number	7085731
OEM Part Number	7085731
Thread Size	10mm
Top Material Type	Iridium
Vehicle Service Type	Car
What Is In the Box	3521

Reviews

M**.

GOOD PRODUCT

20.02.2026

S**T

Value

23.08.2024

R**R

Decent price

30.11.2025

I**I

Great product at a great price

9.07.2024

D**.

Good

2.12.2025

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