These bearings are usually found in application such as: wind turbines, heavy load transporters, solar trackers, harbor cranes, hydraulic equipment, crane steering mechanisms, automation systems, heavy load manipulators, yaw and pitch control tables.
As of June 2020 the WD-LA 0478/3-06373 has been discontinued. It's replacement is WD-L 0478/3-04904. This new product requires a motor or gearbox cylindrical shaft with key input.
Product catalog can be found here.
Product page can be found here.