The part number will be REVTP 120V or REVTP 277V depending on the input voltage needed. What are the OEM part numbers?
120 volt Leviton 9454-A30
277 volt Leviton 9454-C40
These are OEM parts from Leviton that are sold to manufacturers in generally large quantities. It is not a common part that will be on the shelf at a distributor.