4 Years Available
GMC G25 Light Bulb Sizes
Complete bulb size reference for the GMC G25 from 1975 to 1978. Find headlight, fog light, turn signal, and brake light bulb sizes for every model year.
Every GMC g25 from 1975 to 1978 uses the same H6024 low beam bulb — once you confirm your year is within this range, you only need one part number.
Year Range
1975 – 1978
4 model yearsCommon G25 Replacement Parts
Select Your Year
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Frequently Asked Questions
We have bulb size data for the GMC G25 from 1975 to 1978, covering 4 model years. Select your year below for a complete position-by-position bulb chart.
No, the GMC G25 has used the H6024 low beam bulb consistently across all 4 model years in our database. Any year in the 1975–1978 range uses the same bulb.
The GMC G25 uses a H6024 bulb for the low beam. Select your year below for the exact fitment chart.
Yes. The GMC G25 uses a H6024 low beam, and direct-fit LED conversion kits for that size are widely available. LED upgrades typically produce 2–3× more light output than stock halogen and last 25,000+ hours. Look for a DOT-compliant kit with a proper beam cutoff pattern.
Select your model year from the list below. Each year page shows every bulb position — low beam, high beam, fog light, turn signal, and brake light — with the correct size and a link to buy it on Amazon.