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2018 Buick Regal TourX Bulb Size Chart

Bulb sizes may vary by trim, factory lighting package, region, production date, and previous modifications. Verify the bulb number on your existing bulb before buying.

Last database update: May 2026. Manual review status: Not yet manually reviewed.

Verify before buying: check the bulb number printed on your existing bulb, confirm your trim and factory lighting package, and review the seller's fitment notes.
Disclosure: We may earn a commission from links marked Affiliate. Unmarked retailer links may be plain search links. Always verify bulb fitment before purchasing.

2018 Buick Regal TourX Bulb Size Chart

PositionBulb CodeAliasesTrim / PackageFactory TypeConfidenceReviewNotesShop
Low BeamH7—Standard listingHalogenHigh
Pending

Verify trim, factory lighting package, and the bulb number on the existing bulb.

AmazoneBay
High BeamH7—Standard listingHalogenHigh
Pending

Verify trim, factory lighting package, and the bulb number on the existing bulb.

AmazoneBay
Fog LightH11H8 / H9 / H16If equipped / package-dependentHalogenHigh
Pending

If equipped; fog light packages can vary by trim.

AmazoneBay
Turn Signal Rear921—Standard listingHalogenHigh
Pending

Verify trim, factory lighting package, and the bulb number on the existing bulb.

Amazon
Reverse Light921—Standard listingHalogenMedium
Pending

Verify trim, factory lighting package, and the bulb number on the existing bulb.

Amazon
Trunk Light175—Standard listingHalogenMedium
Pending

Verify trim, factory lighting package, and the bulb number on the existing bulb.

Amazon

2018 Buick Regal TourX Fitment Notes

Across the 2018-2020 production range, our database shows changes in the listed Turn Signal Rear positions. Use the chart above for this 2018 model, then confirm the bulb number in your vehicle before buying.

Known fitment limitations

  • factory HID or LED packages may use different parts
  • fog lights may depend on equipment package
  • aftermarket headlight assemblies may use different bulbs
  • regional models and production-date splits may differ

See an incorrect bulb size? Submit a correction.

How do the 2018 Buick Regal TourX's bulbs compare to other years?

The 2019 model continues with the same bulb sizes.

This bulb configuration covers the 2018–2019 model years. 2019 →

Finding the best installation guide...

Other Regal TourX Years

20202019

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H7 Comparisons

9005 vs H7H1 vs H7H11 vs H7H4 vs H7

Frequently Asked Questions

Our database lists H7 for the 2018 Buick Regal TourX low beam headlights. Verify the bulb number on your existing bulb and confirm your trim or factory lighting package before buying.

Our database lists H7 for the 2018 Buick Regal TourX high beam position. Some vehicles vary by trim, lighting package, or previous housing changes.

Dim headlights on a 2018 Buick Regal TourX can come from aging halogen bulbs, cloudy lenses, weak electrical connections, or an incorrect bulb. Confirm the listed H7 size against the bulb in the housing before choosing a replacement or upgrade.

Our database lists H11 for the 2018 Buick Regal TourX fog light position. Fog lights are often package-dependent, so verify that your vehicle is equipped with factory fog lights before ordering.

The 2018 Buick Regal TourX uses a single bulb (dual filament) headlight system. This means one bulb controls both high and low beams.

LED upgrades are available for many H7 applications, but fitment, beam pattern, dashboard warnings, and road-use legality can vary. Use products that list your exact bulb family, such as H7, and verify the factory housing before buying.

Our database has a fog light entry for the 2018 Buick Regal TourX: H11. Fog lights may still depend on trim or equipment package.

Access varies by engine bay layout and headlight housing. Before disassembly, confirm the listed H7 low beam size on the existing bulb or owner's manual, then follow the service procedure for your exact trim.

Rules for LED headlight retrofits vary by location and by housing type. Avoid products that create glare or lack road-use compliance claims, and check local requirements before using an LED conversion on public roads.

Replacement cost depends on bulb technology, brand, and labor access. Common halogen H7 replacements are usually cheaper than LED conversion kits. Check seller fitment notes before comparing prices.

Halogen bulbs and LED replacements differ in output, heat behavior, beam pattern, and electronics. A correct bulb code does not guarantee a correct LED beam pattern, so verify physical fit and seller compatibility notes for the 2018 Buick Regal TourX.