General description Steering Knuckle Hub Left Front for Audi A4, A5, and Q5 models. Ensure that your OEM numbers match one of the numbers listed in the description for proper compatibility. Technical specifications OEM & Reference Numbers: 8K0407253AA, 8K0 407 253 AB Special Outer Diameter: 102.4 mm Diameter after fitting: 16.2 mm Internal Diameter: 42 mm Diameter Tolerance: ± 0.1 mm Compatibility and accessories For Audi A4 Saloon (8K2, B8) (2007/11 - /) For Audi A4 Avant (8K5, B8) (2007/11 - /) For Audi A4 Allroad (8KH, B8) (2009/04 - /) For Audi A5 Sportback (8TA) (2009/09 - /) For Audi A5 Convertible (8F7) (2009/03 - /) For Audi A5 (8T3) (2007/06 - /) For Audi Q5 (8R) (2008/11 - /) Accessories included as shown in the picture Installation Professional installation is recommended. Instruction manual is not included. Other information Warranty: 2 years for any manufacturing defect High quality materials for durability and long life Best price and quick delivery