A.
anwered by: canteau
These endcaps are compatible with DT Swiss hubs and wheelsets that use hubs that have DT Swiss internals like some Giant, Specialized and Bontrager wheels. If Syncros is using a hub that has DT Swiss internals they should work, if not you would have to get Syncros endcaps from a dealer that carries Syncros products.
https://www.syncros.com/us/en/dealers/locator