It doesn't even come close to a hydraulic tensioner. I have an 01" 330xi E46 with one hydraulic and one mechanical pulley and it doesn't fit my E46 idlers. Part # is correct and part is not. The picture looks like the back of a proper pulley but don't be fooled .I returned it for half the price I bought it for but the real thrill is my car got ripped apart waiting for the right pulley I don't know if all the five star reviews are fake are or what but I took a chance took a chance lost money and a week without a car If you have E46 hope you read this before placing an order!
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