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P21/4W 566 TWIN FILAMENT SPEC – 12V 21/4W dual-function design providing brake and tail light operation in compatible rear lamp assemblies. BAZ15D OFFSET PIN FITMENT – Staggered pin configuration ensures correct installation in vehicles requiring offset twin-contact bulbs. SUITABLE FOR BRAKE, TAIL & FOG USE – Designed for rear light applications where P21/4W specification is required. E-MARKED ROAD LEGAL PERFORMANCE – Manufactured to meet ECE standards for compliant rear lighting in UK vehicles. TWIN PACK – REPLACE AS A PAIR OR KEEP A SPARE – Ideal for replacing both rear bulbs together or keeping one available for MOT and roadside emergencies.