(OE Reference Number)-- 11287838797, Manufactured using the same or improved technology and quality materials as the original equipment manufacturer (OEM) components to ensure a factory match (Fitment)--PHILTOP Belt Tensioner with Pulley Replacement For 330i 2001-2005, 525i 1991-1995, 525i 2001-2005, 525iT 1993-1993, 528i 1997-2000, 530i 2001-2005, M3 1995-1999, M3 2001-2006, X3 2004-2006, X5 2001-2006, Z3 1997-2002, Z4 2006-2008, 330xi 2001-2005, 330Ci 2001-2006, 323Ci 2000-2000, 323i 1998-2000, 323is 1998-1999, 325Ci 2001-2006, 325i 1992-1995, 325i 2001-2005, 325is 1992-1995, 325xi 2001-2005, 328Ci 2000-2000, 328i 1996-2000, 328is 1996-1999, 325iX 1990-1991 (Labyrinth Seal Protection)-- PHILTOP automatic drive belt tensioner assembly with pulley adopts labyrinth seal to protect internal components, meeting or exceeding the service life requirements of the original manufacturer (Absorption of extreme vibration for longer life)-- The damping system tested hundreds of times absorbs extreme vibration to improve the life of the tensioner as well as belts and accessories (Torsion spring is stable and reliable)---Torsion round spring design used in PHILTOP tensioner provides reliable and stable tension
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