Interchange: 4513781;7534914;7553666;17117534914;17117553666;17114513781;1711753491 ( Product size: 30.51 Inches,21.85 Inches,4.53 Inches,12.61 Pounds ) Vehicle Fitment for 2006-2010 BMW 525i ,for 2006-2007 BMW 525xi ,for 2008-2010 BMW 528i ,for 2009-2010 BMW 528i xDrive ,for 2008 BMW 528xi ,for 2006-2010 BMW 530i ,for 2006-2007 BMW 530xi ,for 2008-2010 BMW 535i ,for 2009-2010 BMW 535i xDrive ,for 2008 BMW 535xi B-tube fin design: The B-tube fin design adds an additional reinforcing layer inside the tube to strengthen its structure, helping to avoid bending or deformation. The B-tube fin design reinforces the core, preventing excessive up-and-down movement and providing better stability for the core. Quick and easy installation: The testing is essentially a comparison to OEM standards, and our goal is to match the heat dissipation performance as intended by OEM, and improve it wherever possible Buy with confidence Vibeup offers a two years unlimited mileage guarantee. We offer a variety of car parts categories to ensure that you can drive with peace of mind.(If you have any questions, please contact us)