The part number and design is correct, but the measurement is incorrect. The belt is just short enough not to fit the required application. Sort of like being an American and trying to fit into clothing made by orientals.. They just don't fit..
Works great a little more belt stretch than I thought it would have. Started more on the to tight side but after 5 minutes of my truck running it stretched to almost being to loose. But all in all for a custom dual alternator on a 07 Silverado it works great.