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

    PROFORM Calibrated Test Spring 10-190lbs BB1903

    SKU: PFMBB1903
    Product information
    Details...
    Original price was: $40.19.Current price is: $34.95.Add to cart
    Original price was: $40.19.Current price is: $34.95.
    Quantity Only 3 left in stock!
    -+
    Add to cart
    Add to wishlist
  • Add to wishlist
    Sale
    Wheel Front Aftermarket Shop
    Add to wishlist

    MPD RACING Dust Cap For Front Hubs MPD28520

    SKU: MPD28520
    Product information
    • Weight0.13 lbs
    • Dimensions4.7 × 4 × 1.8 in
    • Material

      Aluminum

    • Color

      Black

    • Finish

      Anodized

    • Quantity

      Each

    • Location

      Wheel Hub

    Details...
    Original price was: $29.89.Current price is: $25.99.Add to cart
    Original price was: $29.89.Current price is: $25.99.
    Quantity Only 3 left in stock!
    -+
    Add to cart
    Add to wishlist
  • Add to wishlist
    Sale
    Wheel Front Aftermarket Shop
    Add to wishlist

    MILODON Bb Mopar Low Profile Pan 30930

    SKU: MIL30930
    Product information
    • Weight10.385 lbs
    • Dimensions26 × 12.6 × 8.35 in
    • Material

      Steel

    • Color

      Cadmium

    • Finish

      Plated

    • Quantity

      Each

    • Product Line

      Street & Strip

    Details...
    Original price was: $425.44.Current price is: $369.95.Add to cart
    Original price was: $425.44.Current price is: $369.95.Add to wishlist
  • Add to wishlist
    Sale
    Wheel Front Aftermarket Shop
    Add to wishlist

    HUSKY LINERS Rear Mud Flaps 57671

    SKU: HSK57671
    Product information
    • Weight3.83 lbs
    • Dimensions25 × 20 × 4 in
    • Product Line

      Mud Guards

    • Application Specific

      Yes

    • Material

      Plastic

    • Color

      Black

    • Finish

      Natural

    Details...
    Original price was: $132.00.Current price is: $119.99.Add to cart
    Original price was: $132.00.Current price is: $119.99.Add to wishlist
  • Add to wishlist
    Sale
    Wheel Front Aftermarket Shop
    Add to wishlist

    VIBRANT PERFORMANCE 6mm Union Tee One-Touch Fitting 2677

    SKU: VIB2677
    Product information
    • Weight0.015 lbs
    • Dimensions5.85 × 3.5 × 0.75 in
    • Style

      Air Line Adapter

    • Disconnect Style

      Pushlock

    • Fitting A End 1 Size

      1/4 in

    • Fitting A End 1 Style

      Pushlock

    • Fitting A End 1 O-Ring

      Yes

    Details...
    Original price was: $8.15.Current price is: $6.79.Add to cart
    Original price was: $8.15.Current price is: $6.79.Add to wishlist
  • Add to wishlist
    Sale
    Wheel Front Aftermarket Shop
    Add to wishlist

    HOWE Stud For 22410 +.300 22433

    SKU: HOW22433
    Product information
    • Weight0.94 lbs
    • Dimensions6.85 × 6.25 × 2.15 in
    • Ball Diameter

      1.625 in

    • Taper

      2 in/ft

    • Stud Length

      3.87 in

    • Stud Extended Length

      Plus 0.3 in

    • Stud Thread

      5/8-18 in

    Details...
    Original price was: $53.83.Current price is: $48.94.Add to cart
    Original price was: $53.83.Current price is: $48.94.Add to wishlist
  • Add to wishlist
    Sale
    Wheel Front Aftermarket Shop
    Add to wishlist

    HOLLEY Terminator X-Max Engine Management Systems 550-928

    SKU: HLY550-928
    Product information
    • Weight12.41 lbs
    • Dimensions14.7 × 12.7 × 9.7 in
    • Product Line

      EFI Terminator X Max

    • Wiring Harness Included

      Yes

    • Map Sensor Included

      Yes

    • Map Sensor Style

      1 Bar

    • Self Tuning

      Yes

    Details...
    Original price was: $2,310.00.Current price is: $2,099.95.Add to cart
    Original price was: $2,310.00.Current price is: $2,099.95.Add to wishlist
  • Add to wishlist
    Sale
    Wheel Front Aftermarket Shop
    Add to wishlist

    HOLLEY Main Jets (2) 122-64

    SKU: HLY122-64
    Product information
    • Weight0.02 lbs
    • Dimensions4.95 × 3.45 × 0.55 in
    • Fuel Type

      Gasoline

    • Inside Diameter

      0.0640 in

    • Jet Number

      64.0

    • Style

      Main

    • Thread

      1/4-32 in

    Details...
    Original price was: $17.00.Current price is: $14.69.Add to cart
    Original price was: $17.00.Current price is: $14.69.Add to wishlist
  • Add to wishlist
    Sale
    COMP CAMS SBC Engine Finishing Kit 233
    Add to wishlist

    COMP CAMS SBC Engine Finishing Kit 233

    SKU: COM233
    Product information
    • Weight0.23 lbs
    • Dimensions6.4 × 3.6 × 1.2 in
    • Quantity

      Kit

    • Timing Cover / Oil Pump Dowels Included

      Yes

    • Timing Cover / Oil Pump Dowel Quantity

      2.0

    • Cylinder Head Dowels Included

      Yes

    • Cylinder Head Dowel Quantity

      4.0

    Details...
    Original price was: $21.79.Current price is: $18.95.Add to cart
    Original price was: $21.79.Current price is: $18.95.Add to wishlist
  • Add to wishlist
    Sale
    BELL TECH Street Performance Shock 310400
    Add to wishlist

    BELL TECH Street Performance Shock 310400

    SKU: BLL310400
    Product information
    • Weight4.8 lbs
    • Dimensions19.7 × 3.6 × 3 in
    • Product Line

      Street Performance

    • Internal Design

      Twintube

    • Gas/Hydraulic

      Gas

    • Front Shock Upper Mount

      Stud Mount

    • Front Shock Lower Mount

      Clevis Mount

    Details...
    Original price was: $88.00.Current price is: $79.95.Add to cart
    Original price was: $88.00.Current price is: $79.95.Add to wishlist

    16