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Clearance and side marker lights help other drivers see the outline of your trailer or RV in low light, and they're required equipment in most states. This Peterson light is a compact rectangular unit with an amber lens, built for exterior mounting on the side or rear of a trailer.
It's a small part but an important one for safe towing after dark - well worth replacing right away if a lens has cracked or a light has gone dark.
Check your local regulations for required marker light placement and color before final installation.