You must be talking about the length of the belt....
There is another thread on here somewhere, but the bottom line is not all belt lengths are created equal even if they are labled the same on the packaging..... Measure the belts before you buy them and get the one that is on the long side.
Just in case anyone else runs into this issue with an ATI damper, just get (2) 70mm smooth idler pulleys. Dayco part # 89052.
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