The D4S D4R Ballast (part numbers 85967 22080 and 85967 45010) is a single unit designed for D4S and D4R HID lighting systems. It provides the necessary control and power for proper ignition and stable operation of compatible xenon bulbs. Key benefits - Reliable ignition and steady light output for D4S and D4R HID headlight systems. - Compatibility across variants indicated by the part numbers 85967 22080 and 85967 45010, helping you match the correct specification for your vehicle or installation. - Pack of 1 offers convenient replacement or stocking for service workflows. - Using the correct ballast supports consistent performance and reduces the risk of flicker, misfire, or premature bulb wear. - Understanding the part numbers and compatibility is important for proper installation and system performance. Important attributes - Function: ballast for D4S and D4R lighting systems - Compatibility: part numbers 85967 22080 and 85967 45010 denote versions or specifications; verify against your system - Size: not specified - Material: not specified - Performance: not specified beyond enabling HID operation Use scenarios - Replacing a failed ballast in a vehicle with D4S or D4R HID headlights to restore normal illumination - Auto repair shop scenario where a technician sources a compatible ballast for HID headlight maintenance or repair - HID headlight upgrades or replacements that require a D4S/D4R ballast variant with matching part numbers for proper compatibility