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Item #:
178599099
Holley RetroBright H821 H4 Pin-Out Swap Adapter for Non-Standard Plug
Item #:
178599099
SHP 27
Price Details
Excluding Shipping & Custom charges ( Shipping and custom charges will be calculated on checkout )
*All items will import from US
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In stock
Imported from USA store
QTY:
Only 12 items left in stock.
Order now and get it around Wednesday, September 23
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Holley RetroBright adapters make it a plug-and-play affair.
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Note: Step 1 Voltage Transformer required for using electronics products of US store (110-120). Recommended power converters Buy Now.
What Stands Out
Easy Installation
The Holley Retrobright Adapter simplifies the headlight conversion process, making it accessible for DIY enthusiasts and professionals alike, ensuring a quick and hassle-free setup.
Superior Illumination
Designed to enhance visibility, this adapter optimizes the performance of retrofitted headlights, providing brighter and clearer illumination even in challenging driving conditions.
Durable Construction
Crafted from high-quality materials, the Holley Retrobright Adapter promises longevity and reliability, withstanding harsh environments while maintaining excellent performance over time.
Product Details
- If you don't feel comfortable cutting up your factory wiring or don't want to attempt to swap pins on your headlight plugs, Holley RetroBright adapters make it a plug-and-play affair. If the standard H4 male plug used on Holley RetroBright Headlights will not fit your female socket or you need to swap pins around to match up properly, these harnesses will make the job quick and easy.
| Manufacturer part number | H821 |
| Vehicle model | H821 |
| Automotive electrical part & accessory type | Adapters |
| Compatibility | H4 Non-Standard Plug |
| Vehicle fitment type | Universal |
| Brand | RETROBRIGHT |
| Automotive parts division | Performance, OEM Replacement |
| Rec. use | Automotive |
| Volts | 12 V |
| Accessories | H821 Holley Retrobright Adapter |
| Pieces | 1 |
| Model | H821 |
| Vehicle type | Car, Truck, Motorcycle, Motor Vehicle |
| Has nrtl listing certification | N |
| Assembled product weight | 0.09 lb (40 grams) |
Who Should Buy?
-
Classic Car Enthusiasts
Ideal for those restoring or upgrading classic cars, enhancing lighting features while maintaining retro aesthetics.
-
Custom Builders
Perfect for custom vehicle builders seeking innovative solutions for integrating modern lighting in traditional setups.
-
DIY Mechanics
Great for hobbyists and DIY mechanics looking for an easy adapter to improve illumination in their projects.
-
Modern Vehicle Owners
Not suitable for owners of modern cars that already have advanced lighting systems and do not require retrofits.
Product Description
Have any Query? Chat with us
Customer Questions & Answers
-
Question:
Do I need to cut my factory wiring to install these adapters?
Answer: No, the Holley RetroBright adapters allow for a plug-and-play installation without cutting. -
Question:
What type of headlight sockets are compatible with this product?
Answer: It connects to non-standard H4 sockets or those requiring a pin swap. -
Question:
Is this adapter safe to use in California?
Answer: There is a warning about chemicals that may cause reproductive harm, but the adapter is safe to use when properly installed.
RETROBRIGHT Automotive Electrical Editorial Review
Holley RetroBright H821 H4 Pin-Out Swap Adapter for Non-Standard Plug is a versatile automotive accessory designed for various vehicle types, including cars, trucks, and motorcycles. This adapter is tailored for H4 non-standard plugs, ensuring compatibility across a wide range of vehicles. Users appreciate its lightweight design and universal fitment, making installation a breeze. With a manufacturer part number of H821, this adapter is useful for performance and OEM replacement applications, contributing to improved lighting solutions in automobiles. It's a dependable choice for those looking to upgrade or customize their vehicle's lighting system.
Customer Reviews & Ratings
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Pros
- Universal fit for various vehicle types
- Designed for H4 non-standard plugs
- Lightweight at just 0.09 lb
- Easy installation process
- Ideal for performance and OEM applications
Cons
- Limited compatibility for specific non-standard plugs
Platform Trust & Buyer Confidence
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Jazz
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“Easy to use and always helpful and sorts any issues I've had past and present”
1 September 2026 · via Trustpilot
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“Fast, convenient and cheap. Great store!”
27 August 2026 · via Trustpilot
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Important information
- Limitations : For products shipped internationally, please note that any manufacturer warranty may not be valid; manufacturer service options may not be available; product manuals, instructions, and safety warnings may not be in destination country languages; the products (and accompanying materials) may not be designed in accordance with destination country standards, specifications, and labeling requirements; and the products may not conform to destination country voltage and other electrical standards (requiring use of an adapter or converter if appropriate). The recipient is responsible for assuring that the product can be lawfully imported to the destination country. When ordering from Ubuy or its affiliates, the recipient is the importer of record and must comply with all laws and regulations of the destination country.
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SHP 27
Order now and get it around Wednesday, September 23
This item is not restrict in my country.(Please click on above link if this item is not restrict in your country, So our team will review and allow.)
QTY:
Only 12 items left in stock.
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Features & Benefits
- Easily connects Holley RetroBright Headlights to non-standard H4 sockets.
- No need to cut factory wiring for safe installation.
- Quick and easy solution for pin swaps on headlight plugs.
- Entry-level plastic version available for budget-conscious customers.
- Perfect for those unsure about DIY wiring or pin swaps.
- Eliminates installation headaches, ensuring a straightforward upgrade.
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