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Product Function:Seals the rear of the headlight housing to prevent dust, moisture, and debris from entering, protecting bulbs and internal components. Replacement Part:Replaces OEM part numbers 63117204272, 63117348932, and 63127270076, restoring proper sealing when the original cap is lost or damaged. Fitment:Compatible with BMW 1 Series F20 and 5 Series E60 models, as well as other vehicles such as X5, X6, and Z4 requiring the same part number. Material and Design:Durable plastic construction designed to withstand heat from headlights and environmental exposure while maintaining a secure seal. Application Scenario:Used during headlight maintenance or bulb replacement to ensure proper sealing, prevent condensation, and maintain lighting performance.