Product review (3 stars): You almost certainly don't need this.
This is a simple round polyurethane belt that is meant to be melted together. There's a 99.9% chance that if yours failed, it simply failed at the melted "weld" and just needs to be *gently* re-melted together. I see some people are struggling taking apart their dryer to get this belt fitted, but at the factory they just melt it in place. All you need is a heat gun or blowdryer or even a lighter+knife, and a second set of hands to help hold things in place while you work.