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The 1156 and 1157 are different bulbs. The 1156 is a single element bulb, generally for something like backup lights or side marker lights. The 1157s are dual element for combination applications such turn signals and brake lights.
The 1156 and 1157 are different bulbs. The 1156 is a single element bulb, generally for something like backup lights or side marker lights. The 1157s are dual element for combination applications such turn signals and brake lights.