3 Years Available
GMC R3500 Light Bulb Sizes
Complete bulb size reference for the GMC R3500 from 1988 to 1991. Find headlight, fog light, turn signal, and brake light bulb sizes for every model year.
The GMC r3500 changed low beam specifications across model years — 1990–1991: H4703; 1988: H6054. Make sure to select your exact year below to get the right bulb size.
Year Range
1988 – 1991
3 model yearsBulb Sizes Across Years
| Position | Bulb Type(s) | Years | Status |
|---|---|---|---|
| Low Beam | H4703(1990–1991) H6054(1988–1988) | 3 years | Changed |
| Side Marker | 194(1988–1991) | 3 years | Consistent |
| High Beam | 9005(1988–1991) | 3 years | Consistent |
| Brake Light | 3157CK(1990–1991) | 2 years | Consistent |
| Turn Signal Rear | 3157CK(1990–1991) | 2 years | Consistent |
| Tail Light | 3157CK(1990–1991) | 2 years | Consistent |
| License Plate | 194(1988–1991) | 3 years | Consistent |
| Reverse Light | 3156(1990–1991) 1156(1988–1988) | 3 years | Changed |
Common R3500 Replacement Parts
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Frequently Asked Questions
We have bulb size data for the GMC R3500 from 1988 to 1991, covering 3 model years. Select your year below for a complete position-by-position bulb chart.
Yes, the GMC R3500 changed low beam bulb specifications across generations: 1990–1991: H4703; 1988–1988: H6054. Make sure to check your exact year using the list below.
The GMC R3500 uses a H4703 bulb for the low beam and a 9005 for the high beam. Select your year below for the exact fitment chart.
Yes. The GMC R3500 uses a H4703 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.