Exact OEM Fitment and Compatibility : This car start cylinder assembly is made to meet OEM standards, serving as a direct replacement for part numbers , 4B0905851F, and 4B0905851M. Solves Common Jamming and Mechanical Failures : This assembly directly addresses frequent issues in older German vehicles, such as jamming. Heavy Duty Alloy Build for Enhanced Security : Crafted from high rigidity die cast aluminum alloy, this cylinder features a heat and anti shake housing. Complete Package with and Remote Shell : The set includes two standard anti slip handle keys and single 3 button folding remote shell with a . All Inclusive Assembly for Easy Installation : This comprehensive set contains the full block assembly