| Location | Size | |
| Rear | 4x6" | |
| Front Side Door | 6.5" |
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1988 GMC G2500 Car Audio and Video Parts & Accessories
Speakers:
Lighting:
| Location | Bulb | |
| Back Up Light | 1156 | |
| Brake | 2057 | |
| Center High Mount Stop Light | 921 | |
| Courtesy | 194 | |
| Dome Light | 211-2 | |
| Front Side Marker | 194 | |
| Front Turn Signal | 2057NA | |
| High Beam and Low Beam Headlight | H6054 | |
| High Beam Headlight | H4651 | |
| High Beam Indicator | 161 | |
| Instrument Panel | 161 | |
| License Plate | 67 | |
| Low Beam Headlight | H4656 | |
| Parking Light | 2057NA | |
| Rear Turn Signal | 2057 | |
| Tail Light | 2057 |
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