Evergreen T20700L 97-11 Ford Explorer, Ranger, Mazda B4000, Mercury 4.0L SOHC Left Tensioner (Replaces 7U3Z-6K254-B) Fits: 97-11 Ford Explorer, Ranger, Mazda B4000, Mercury 4.0L SOH (see description below) All of our tensioner are produced under strictly observed quality under highest ISO 9001:2000 international standards Maintaining optimal chain tension throughout the revolutions per minute range Designed to meets or exceeds OE performance requirements Ideal for stock replacement and mild performance applications