Description

Headlight Adapter – RetroBright – Housings / Wiring Pigtails Included – Plastic – Black – H4 to Non Standard H4 – Kit

Why Choose Us?



Frequently Asked Questions​

As an Authorized Automotive Retailer in the United States, we take pride in guaranteeing 100% authentic products from all brands available on our website. With partnerships spanning 1,000+ brands and a network of 20+ distributor warehouses nationwide, we maintain millions of auto parts in inventory across the USA, ensuring quick shipping and reliable service to our customers. When you shop with us, you're investing in quality and trust.
We believe we have the fastest backorder system in the U.S. auto parts industry, thanks to our strong partnerships with brands and vendors. Nearly all backordered auto parts are shipped directly by the vendors without any additional delays, or they are placed as special orders on the same day. In most cases, backordered parts are delivered within 5-10 days.
We offer unbeatable prices and the best shipping rates on auto parts, with exclusive protection and insurance included to safeguard your order from damage or loss. Enjoy convenient door-to-door delivery, real-time tracking, and our 100% satisfaction guarantee for a smooth, worry-free experience.
Our standard shipping typically takes 1-3 business days. We will provide estimated shipping time for each product. While we aim to deliver as quickly as possible, this timeframe ensures all orders are processed, prepared, and dispatched with care. If the products are not ready for shipping in 72 hours, we will refund you 100%
Absolutely. Once your order is dispatched, you’ll receive an email with tracking details, so you can follow your shipment every step of the way. Every step of shipping process will be sent through email notifications or using tracking page.
Every product page includes a stock level indicator to show what’s available. We always update the inventory 24/24. We’ll be happy to check availability and provide updates on new stock arrivals if you need a help.
We’re sorry to hear that your order wasn’t delivered in perfect condition. Please email us with your order number, a description of the issue, and photographs of the damaged item. Once we receive this information, we’ll arrange for a replacement or refund and handle the return process.
You can return items within 30 days of receipt. Ensure the product is new in its original packaging and securely wrapped for safe transit. Once we receive the item in sellable condition, we’ll issue a full refund for the product value. Contact us for the return address and further instructions.

International Shipping

Below are estimated rates and delivery times for popular destinations; full carrier options are available at checkout.

Our dedicated team has years of experience managing international logistics and customs documentation to ensure smooth delivery from our US warehouse to your door. Please review our shipping policy and local import regulations before ordering.

Loading international estimates...

Reviews

There are no reviews yet.

Be the first to review “RETROBRIGHT Adapter H4 H821”

Your email address will not be published. Required fields are marked *

Recently viewed products

  • Add to wishlist
    Sale
    Wheel Front Aftermarket Shop
    Add to wishlist

    MEZIERE Starter Relay Kit WIK400

    SKU: MEZWIK400
    Product information
    • Weight0.95 lbs
    • Dimensions4.7 × 3.3 × 3.2 in
    • Quantity

      Kit

    • Intended Application

      Starter

    • Amp Rating Per Circuit

      200 amp

    • Circuit Quantity

      1.0

    • Wiring Harness Included

      Yes

    Details...
    Original price was: $123.03.Current price is: $106.98.Add to cart
    Original price was: $123.03.Current price is: $106.98.
    Quantity Only 3 left in stock!
    -+
    Add to cart
    Add to wishlist
  • Add to wishlist
    Sale
    Wheel Front Aftermarket Shop
    Add to wishlist

    SEALED POWER Moly Piston Ring Set E458K

    SKU: SEAE458K
    Product information
    • Weight0.79 lbs
    • Dimensions5.05 × 5 × 3.25 in
    • Product Line

      Performance

    • Bore (Standard)

      4.000 in

    • Bore (Metric)

      101.60 mm

    • Tension

      Standard

    • Top Ring Included

      Yes

    Details...
    Original price was: $77.01.Current price is: $70.01.Add to cart
    Original price was: $77.01.Current price is: $70.01.Add to wishlist
  • Add to wishlist
    Sale
    Wheel Front Aftermarket Shop
    Add to wishlist

    JERICO Piston Clutch JER-0038

    SKU: JER0038
    Product information
    Details...
    Original price was: $21.57.Current price is: $18.76.Add to cart
    Original price was: $21.57.Current price is: $18.76.Add to wishlist
  • Add to wishlist
    Sale
    Wheel Front Aftermarket Shop
    Add to wishlist

    VENTSHADE Window Ventvisor 194313

    SKU: VEN194313
    Product information
    • Weight2.23 lbs
    • Dimensions47 × 12 × 2 in
    • Product Line

      In-Channel Ventvisor

    • Application Specific

      Yes

    • In Channel / Out Of Channel

      In Channel

    • Front Included

      Yes

    • Material

      Plastic

    Details...
    Original price was: $77.00.Current price is: $69.99.Add to cart
    Original price was: $77.00.Current price is: $69.99.
    Quantity Only 5 left in stock!
    -+
    Add to cart
    Add to wishlist
  • Add to wishlist
    Sale
    Wheel Front Aftermarket Shop
    Add to wishlist

    VHT Gloss White Eng. Enamel SP129

    SKU: VHTSP129
    Product information
    • Weight0.945 lbs
    • Dimensions7.85 × 2.6 × 2.55 in
    • Product Line

      Engine Enamel

    • Finish

      Gloss

    • Quantity

      Each

    • Variant

      Yes

    • Paint Type

      Ceramic Urethane

    Details...
    Original price was: $12.75.Current price is: $11.59.Add to cart
    Original price was: $12.75.Current price is: $11.59.
    Quantity Only 1 left in stock!
    -+
    Add to cart
    Add to wishlist
  • Add to wishlist
    Sale
    Wheel Front Aftermarket Shop
    Add to wishlist

    HOLLEY Secondary Diaphragm 135-6

    SKU: HLY135-6
    Product information
    • Weight0.08 lbs
    • Dimensions7 × 5 × 1.8 in
    • Material

      Rubber

    • Quantity

      Each

    • Color

      Natural

    • Finish

      Natural

    • Primary / Secondary

      Secondary

    Details...
    Original price was: $72.00.Current price is: $65.19.Add to cart
    Original price was: $72.00.Current price is: $65.19.Add to wishlist
  • Add to wishlist
    Sale
    Wheel Front Aftermarket Shop
    Add to wishlist

    GRANT Quick Release Hub Ford 3022

    SKU: GRT3022
    Product information
    • Weight1.053 lbs
    • Dimensions5.2 × 4.7 × 2.5 in
    • Quantity

      Kit

    • Variant

      Yes

    • Material

      Steel

    • Color

      Natural

    • Finish

      Natural

    Details...
    Original price was: $170.47.Current price is: $154.97.Add to cart
    Original price was: $170.47.Current price is: $154.97.
    Quantity Only 4 left in stock!
    -+
    Add to cart
    Add to wishlist
  • Add to wishlist
    Sale
    Wheel Front Aftermarket Shop
    Add to wishlist

    WINTERS Quick Change Gears 4416

    SKU: WIN4416
    Product information
    • Weight3.65 lbs
    • Dimensions7.2 × 4.6 × 1.6 in
    • Spline

      6

    • Set Number

      16.0

    • Gear 1 Tooth Count

      16.0

    • Gear 2 Tooth Count

      26.0

    • 3:78 Ring And Pinion Low Ratio

      2:33

    Details...
    Original price was: $90.12.Current price is: $81.93.Add to cart
    Original price was: $90.12.Current price is: $81.93.
    Quantity Only 2 left in stock!
    -+
    Add to cart
    Add to wishlist
  • Add to wishlist
    Sale
    ENDERLE Hi-Speed Assembly  Blown 7018
    Add to wishlist

    ENDERLE Hi-Speed Assembly Blown 7018

    SKU: END7018
    Product information
    • Weight0.245 lbs
    • Dimensions4.8 × 4 × 1.1 in
    • Material

      Aluminum

    • Color

      Black

    • Finish

      Anodized

    • Quantity

      Each

    • High Speed

      Yes

    Details...
    Original price was: $143.43.Current price is: $130.39.Add to cart
    Original price was: $143.43.Current price is: $130.39.Add to wishlist
  • Add to wishlist
    Sale
    COMP CAMS 8 Oz Assembly Lube 104
    Add to wishlist

    COMP CAMS 8 Oz Assembly Lube 104

    SKU: COM104
    Product information
    • Weight0.61 lbs
    • Dimensions4.7 × 2.45 × 2.4 in
    • Quantity

      Each

    • Variant

      Yes

    • Intended Purpose

      Engine Assembly

    • Conventional / Synthetic

      Conventional

    • Extreme Pressure

      Yes

    Details...
    Original price was: $20.64.Current price is: $17.95.Add to cart
    Original price was: $20.64.Current price is: $17.95.Add to wishlist

    99