All three major systems use a 52mm OD bearing have the same top bearing fitment (FSA ACR, Deda DCR, Token/Enve). This frame is designed to fit the ACR spec, so the other 2 should also work for the top bearing.
The brand-specific ones (e.g., Trek and Specialized) are custom and use their own specs; unfortunately, the copy bikes also seem to be copying this.
