I bought 3 Brose replacement belts from this supplier, "e86001" mark on the belts. These 3 belts for 3 different customers. It has been 4 weeks approx since replaced with new belts. So far so good...
As far as I know, Brose does not build belts, Gates design and build belts for Brose. Brose does not sell belts E86001, have to send in for repair. Here is the Brose Replacement Drive Belts, not sure if it ship to USA.