This strap end is based on several finds from Gotland, such as: https://samlingar.shm.se/object/9CBD52E5-EB67-4704-BFFD-B89FB84622F1.
It fits belts that are at least 17 mm wide. A wider buckle is not an issue as the leather can be easily narrowed at the end of the belt. Up to 30 mm width is fine. The key requirement is that the leather is at least 17 mm wide for the strap end to be attached.