Litens was the Original Equipment (O.E.) supplier of this part and offers this upgraded part for the aftermarket. The Litens product meets or exceeds all original equipment form, fit, and function specifications for this Cadillac tensioner This tensioner was upgraded to increased performance and provide a longer service life. Included in the upgrade was a change in pulley material from plastic to steel. This tensioner maintains the integrated lift feature for ease of belt installation and removal. Note: Most Non-O.E. aftermarket suppliers of this tensioner have removed the critical internal damping components. Choosing The Correct Replacement Part: Both the original equipment and Litens aftermarket tensioner use a round spring versus a flat spring and are marked "Made in Canada". Litens is the world's largest supplier of original equipment (O.E.) power transmission products. At Litens, we design systems that are more efficient, resulting in tangible fuel economy/emissions benefits. Litens holds over 2000 patents and continues to respond to the ever-changing automotive industry by investing heavily in new technology, facilities, and people. 90% of our line is made of products coming from the OE manufacturer, which makes the Litens Tensioning Products portfolio the purest OE tensioning line in the North American aftermarket.