Key features

• •Belt tensioner Fits For:BMW 128I 08-13,323I 06-11,325I/325XI 2006,328I/328XI 07-13,330I/330XI 2006,525I/525XI 06-07,528I/528XI 08-10,530I/530XI 06-07,Z4 06-11,X3 07-10,X5 07-10
• •OEM part numbers:39112 11287530314 11288624196 89399 419-365
• •The replacement automatic serpentine belt tensioner pulley assembly transports power to the alternator,power steering pump,air conditioning and keeps it running smoothly and effectively.It is designed for vehicles that needs an automatic belt tensioner.The torsional round spring design provides consistent tension for maximum durability
• •Belts、tensioners and idler pulleys are designed to the same life cycle，when one of them is replaced,the othes had likely met their design cycle as well, so it is recommended to replace all of them when replacing one of the parts just wanna avoid to having the influences of other accessories'service life
• •For more detailed assembly information, check out our instruction section. If there is any problem with our belt tensioner assembly, please feel free to contact us and we will solve it for you in time