where does one find a 3/8 inch spark plug socket socket? I can only find 5/8 inch and larger.

Unless these are somehow the tiniest spark plugs in existence, you do not need a 3/8” socket. 5/8” will be the correct socket size and 3/8” will be the size of the ratchet attachment on the other end of the socket. 3/8” is about 10 mm which is smaller than the threads on this plug.

will this fit 2004 dodge ram 1500 4.7 liter 4x4 v8?

No, these Autolite XP3923 spark plugs fit 2002-2005 Dodge Ram 1500 (3.7L). Autolite XP5224 will fit 2002-2007 Dodge Ram 1500 (4.7L V8).

Will these spark plugs fit 2003 Altima 2.5

Hello, no these will not fit a Altima. Ngk are the original part number 6240. Please let us know if we can be of further assistance.

Where are these made?

Autolite Iridium XP spark plugs are designed and engineered in the USA. However, they are manufactured in China - as are all Autolite spark plugs.

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Autolite Iridium XP Automotive Replacement Spark Plugs, XP3923 (4 Pack)

Autolite Iridium XP Automotive Replacement Spark Plugs, XP3923 (4 Pack)

Product ID: 29121327

Details

Brand
Autolite Ultra
Core Material
Iridium
Thread Size
5/8"
Top Material Type
Alloy Steel
Vehicle Service Type
Car Truck

⚡Platinum ground wire & V-trimmed electrode for optimal ignition

⛽0.6mm iridium finewire tip for max fuel efficiency

🛠️Up to 100,000 miles extended change interval

Autolite Iridium XP Automotive Replacement Spark Plugs, XP3923 (4 Pack)

Product ID: 29121327

Details

Brand
Autolite Ultra
Core Material
Iridium
Thread Size
5/8"
Top Material Type
Alloy Steel
Vehicle Service Type
Car Truck

⚡Platinum ground wire & V-trimmed electrode for optimal ignition

⛽0.6mm iridium finewire tip for max fuel efficiency

🛠️Up to 100,000 miles extended change interval

27534 Ft

Duties & taxes included

In stock

Sold byAmazon HungaryDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Hungary.

Secure transaction

Description

⚡ Ignite Performance, Slash Fuel Costs, Own the Road!

TRUSTED HERITAGE - Backed by Autolite’s legacy since 1936, ensuring reliability and OE-level quality.
FUEL SMART DESIGN - Advanced electrode technology optimizes combustion, enhancing fuel efficiency and lowering emissions.
PRECISION IGNITION - 0.6mm finewire iridium tip with laser welding delivers sharper, more consistent sparks for smoother starts.
PLUG PLAY UPGRADE - Fits a wide range of vehicles with easy installation and a lifetime limited warranty for peace of mind.
UNMATCHED LONGEVITY - Engineered to last up to 100,000 miles, reducing maintenance frequency and cost.

Autolite Iridium XP Spark Plugs (4 Pack) combine cutting-edge 0.6mm iridium finewire technology with platinum-protected ground electrodes to deliver up to 100,000 miles of reliable, fuel-efficient ignition. Designed for both domestic and foreign vehicles, these plugs offer superior durability, consistent performance, and a lifetime limited warranty, making them the smart upgrade for professionals who demand peak engine responsiveness and cost-effective maintenance.

Specifications

ASIN	B009J58FJA
Automotive Fit Type	Vehicle Specific Fit
Best Sellers Rank	#168,002 in Automotive ( See Top 100 in Automotive ) #981 in Automotive Replacement Spark Plugs
Brand	Autolite Iridium Ultra
Brand Name	Autolite Iridium Ultra
Compatible with Vehicle Type	Car, Truck
Core Material	Iridium
Customer Reviews	4.6 out of 5 stars 2,480 Reviews
Gap Size	0.04 inches
Global Trade Identification Number	00009100044334
Included Components	4 Iridium Spark Plugs
Item Highlight	Replaces 41-111 12571164 3297 7421 2095 127. 40k-60k mileage rated.
Item Type Name	Spark Plug
Manufacturer	FRAM
Manufacturer Part Number	XP3923-4PK
Manufacturer Warranty Description	Lifetime Limited Warranty
Model Number	XP3923-4PK
Number of Items	4
OEM Equivalent Part Number	XP3923-4PK
Thread Size	5/8"
Top Material Type	Alloy Steel
UPC	009100044334
Unit Count	4 Count
Vehicle Service Type	Car, Truck

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Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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TrustScore 4.5 | 7,300+ reviews

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Smooth transaction and product arrived in perfect condition.

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27534 Ft

Duties & taxes included

In stock

Sold byAmazon HungaryDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Hungary.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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