This trunk lid spring is designed for BMW 5 Series F10 models and provides a direct, reliable replacement for a worn or damaged spring. It is associated with OE numbers 51247204366 and 51247204367. Key benefits Restores smooth trunk opening and proper holdopen function with reliability Direct replacement for old or damaged springs, reducing installation effort Improves trunk operation, saving time and effort during use Compatibility and fitment Suitable for BMW 5 Series F10 (production 012009102016), including models 520d, 520i, 523i, 525d, 528i, 530d, 530i, 528iX, 535iX, 535d, 535i, 550i, 550iX, and M5 (012009102016) Suitable for F10 LCI versions (082012102016) OE references: 51247204366 and 51247204367 Also referenced as a boot spring and boot spring for F10 applications (520d boot spring) Performance Professional production and reliability to make trunk opening easier and more consistent Service guarantee Customer service available for questions or concerns Applications and use scenarios Replacing a worn or damaged trunk lid spring on BMW F10 5Series to restore proper opening effort and holdopen function Installing on M5 or LCI F10 variants to maintain reliable trunk operation Use in routine maintenance or to ensure the trunk opens smoothly and stays open as intended