Many vehicles use H10, 9140, or 9145 bulbs in their factory fog lights. While these bulb types sound different, they share nearly the same physical design as the far more common 9005 bulb.
Because the 9005 is significantly more popular, manufacturers offer it in a wider range of halogen, LED, and HID options. As a result, many drivers choose a 9005 bulb when upgrading fog lights that originally use H10, 9140, or 9145 bulbs.
In most cases, a 9005 bulb will install with little or no modification at all. When a change is required, it’s minor and easy to complete with basic tools.
Why 9005 Bulbs Often Work
The base design, electrical characteristics, and locking style of these bulbs are very similar. The primary difference comes down to one small alignment tab on the bulb’s mounting collar.
That small tab can prevent the 9005 bulb from fully seating in some fog light housings designed for H10, 9140, or 9145 bulbs. Fortunately, correcting this takes only a few minutes.
How to Modify a 9005 Bulb to Fit
As shown in the reference photo, you only need to adjust one tab on the upper-left corner of the 9005 bulb. Compare a stock 9005 bulb to a modified one and you’ll see the difference immediately.
Here’s how to do it:
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Identify the upper-left mounting tab on the bulb
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Remove roughly half of the tab’s height, trimming material from the top
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Use a small coarse file or a Dremel tool
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Take your time and test-fit as you go
You don’t need exact measurements. The goal is simply to shorten the tab enough for the bulb to rotate and lock into place.
Important Handling Tips
Avoid touching the glass portion of the bulb during this process. Oils from your skin can shorten bulb life, especially with halogen bulbs. If contact occurs, clean the bulb with isopropyl alcohol before installation.
Once you modify one bulb, repeat the same adjustment on the second bulb. After that, installation should go smoothly.
When No Modification Is Needed
Some fog light housings already accept the 9005 bulb without changes. Always test-fit the bulb before trimming anything. If it locks in securely, you’re good to go.
Choosing the Right Bulb Type
Because of its popularity, the 9005 format gives you access to:
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Halogen replacements
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LED fog light upgrades
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HID conversion options
View all available fog light bulb options here: Headlight Revolution: 9005
To stay up to date on fog light bulb fitment, lighting upgrades, and installation guides, be sure to check back here regularly. You can also follow along on our Facebook page and say hello. And as always, the Better Automotive Lighting Blog is your source for clear, practical information in the automotive lighting world. Why not give this a read: What Is the Best H11 LED Bulb in 2026?
Meet the people behind Better Automotive Lighting
John Tobias, Headlight Junkie and Industry Veteran
Before managing pricing and product categories for the DLG brands, John worked directly with customers in customer service and tech support, then spent several years in marketing creating content like this and the videos published online. Today he takes more than ten years of aftermarket automotive lighting experience to events all over the USA, meeting customers and talking to real people about what they care about. He is focused on understanding the market, the trends, the big players, and what matters to lighting enthusiasts. John has tested thousands of lights, works directly with lighting engineers to evaluate the technical performance behind every recommendation, and is one of the foremost experts on everything happening in the world of aftermarket automotive lighting. LinkedIn
