I also looked. Сore’s belt is poly V-ribbed with 8 ribs, a little less than 19 mm wide, but the length is not completely clear. I measured the outside circumference and got about 965-970 mm. But belts are often described as “length” or “effective length”. If I understood correctly, such a measurement goes along the cord. However, there is a mark “374J” on the Core’s belt, which denotes the length of the belt. However, I was unable to find belts with this length. The closest longest that could be found is Gates PJ955 / 8 376J8 MICROV. It will probably be a little longer than necessary, so when installing it, will need to experiment a little with the tension. Or measure the tension of the original belt and install a new one with the same.