This is the EXACT tensioner used by Mercedes Benz in my 2007 ML350. The part number is the same but the original MB part also had an MB part number on the back. AutohausAZ sells it in an Ina box for almost $100. Just buy a gate. It's cheaper, exact part and perfect fit. Gates now manufactures these parts in Turkey. This is a global economy and no one should care. Order the matching Gates belt now. And don't forget the idler pulleys. There are two in my car.