This engine belt tensioner pulley chain adjuster serves as a timing chain guide and is compatible with 1ZZ, 3ZZ, and 4ZZ engines.It is designed to support proper timing chain alignment and engine performance.Compatible with the following vehicle models: - Celica GT 1.8L (2000–2005) - Celica GTS 1.8L (2000–2005) - CE 1.8L (1999–2008) - LE 1.8L (1999–2008) - S 1.8L (2001–2008) - Sport 1.8L (2008) - VE 1.8L (1999–2000) - XRS 1.8L (2005–2006) - MR2 Base 1.8L (2000–2005)