The belt tensioner assembly has a smooth contact surface on the backside.
It has one pulley and is designed for use with a V-ribbed belt, the pulley is not flanged.
The assembly has one mounting hole and an outside diameter of 2.76 inches, bearing bore inside diameter is 0.67 inches
The interchange part numbers for this belt tensioner assembly include 305399, GTA1084, 999444, 39112, 89399, 89399FN, 28708, 999444, 11287530314, 11288624196, and 49463.
Fitment: Compatible with BMW 128i 323i 325i 328 330 525 528 530 X3 X5 Z4 2006 2007 2008 2009 2010 2011, Please check the compatibility list to make sure it is suitable for your vehicle.