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3 Years Available

GMC R2500 Light Bulb Sizes

Complete bulb size reference for the GMC R2500 from 1987 to 1989. Find headlight, fog light, turn signal, and brake light bulb sizes for every model year.

The GMC r2500 changed low beam specifications across model years — 1989: H4703; 1988: 9006; 1987: H6054. Make sure to select your exact year below to get the right bulb size.

Year Range

1987 – 1989

3 model years

Most Common Low Beam

H4703

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Bulb Sizes Across Years

PositionBulb Type(s)YearsStatus
Side Marker
194(1988–1989)
168(1987–1987)
3 yearsChanged
High Beam
H4701(1988–1989)
H4651(1987–1987)
3 yearsChanged
Low Beam
H4703(1989–1989)
9006(1988–1988)
H6054(1987–1987)
3 yearsChanged
License Plate
194(1988–1989)
2 yearsConsistent
Reverse Light
1156(1987–1989)
3 yearsConsistent

Common R2500 Replacement Parts

Side Marker

194

High Beam

H4701

Low Beam

H4703

License Plate

194

Select Your Year

1989

H4703

1988

9006

1987

H6054
10010001000 Series15015001500 Series2502500

Frequently Asked Questions

We have bulb size data for the GMC R2500 from 1987 to 1989, covering 3 model years. Select your year below for a complete position-by-position bulb chart.

Yes, the GMC R2500 changed low beam bulb specifications across generations: 1989–1989: H4703; 1988–1988: 9006; 1987–1987: H6054. Make sure to check your exact year using the list below.

The GMC R2500 uses a H4703 bulb for the low beam and a H4701 for the high beam. Select your year below for the exact fitment chart.

Yes. The GMC R2500 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.