GTMOTO D3S HID Bulbs 66340 42403 — Direct Replacement for GM 13587843 (2 Pack) 6000K
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Description
xUpgrade your GM headlamps with GTMOTO D3S HID bulbs
GTMOTO D3S HID bulbs 66340 42403 are designed as a straightforward, two-bulb upgrade for select GM headlamp systems. Built to fit a range of Buick, Cadillac, Chevrolet, and GMC assemblies, these bulbs deliver a daylight white glow at 6000K and a brighter, more focused beam that can help highlight road edges, lane markings, and distant signage on night drives. The result is a more confident nighttime driving experience without altering the vehicle’s original wiring or ballast configuration.
Two enhancements stand out for real-world use: a stronger, more precise beam pattern and quicker light readiness. The bulbs are built to respond quickly when you switch on the headlights, reaching peak brightness with minimal warm-up. This instant-on feel can be helpful when maneuvering in dim neighborhoods or transitioning from street lighting to darker highways.
Key benefits you might notice
- Up to 1.5x brightness versus older stock bulbs, helping with long-range visibility.
- 6000K daylight white light for a crisper, more natural color impression on dark roads.
- Fast ignition and a short warm-up period to reach top brightness.
- Long-lasting anti-UV quartz glass designed to keep output stable over time.
- Direct replacement format with a 2-pack, intended for a simple, tool-free upgrade.
Important compatibility notes: these bulbs are designed for 35W HID systems with D3S/D3SC1 ballast configurations and a 42VAC ballast environment. They are not intended for traditional 12V halogen systems or non-HID setups. If your vehicle uses a different color temperature era or ballast type, please verify compatibility before purchasing.
Installation and vehicle compatibility
Designed for a quick upgrade, installation is described as around 10 minutes with no modification required. The two bulbs come in a protective package to ensure safe transit and handling. The lineup covers a broad set of GM vehicles and headlamp assemblies, including models from Buick, Cadillac, Chevrolet, and GMC that use D3S style HID headlamps or AFs-style adaptive bi xenon front lamps.
- Compatible with select Buick, Cadillac, Chevrolet, and GMC headlamp assemblies that use D3S type HID bulbs.
- Intended for adaptive bi xenon and premium bi-xenon front lamp setups where D3S is specified.
In short, GTMOTO D3S bulbs offer a practical, high-visibility upgrade option for drivers looking to refresh aging HID lighting with a modern, daylight-like appearance. While results can vary by vehicle condition and ballast, many users report clearer nighttime visibility and a more confident driving experience after installation. Always ensure ballast and assembly compatibility before purchasing to maximize performance.
FAQ
Q: What color temperature and brightness can I expect from GTMOTO D3S bulbs?
A: They emit a 6000K daylight white beam with enhanced brightness for clearer night visibility.
Q: Are these bulbs a direct GM headlamp replacement and how long do they last?
A: Yes, they fit as a 2-pack direct replacement for D3S headlamps on many GM models and can last over 3000 hours.
Shipping & Return
xReturns Policy
You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Shipping
We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
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