So I just opened the box and can't say anything about the quality and use of the flanges. As you can see in the photo I managed to get two different flanges, one looks like the product in someone else's photos, the other looks like someone welded their own bolts and cut them in two with a cutting wheel cut in half. And one of the flanges is two inches, the other almost two and a half, and they came in different packaging? Either there was a mix-up or Walker has serious quality control issues.