97-11 Ford Explorer, Ranger, Mazda B4000, Mercury 4.0L SOHC Left and Right Tensioner (Replaces 7U3Z-6K254-B, 7U3Z-6K254-A) Maintaining optimal chain tension throughout the revolutions per minute range Utilizes a unique hydraulic pressurizing mechanism that efficiently dampens timing chain vibration All of our tensioner adjusters or hydraulic tensioners are produced under strictly observed quality under highest ISO 9001:2000 international standards Designed to meets or exceeds OE performance requirements Please see description details below to ensure the fitment