The 442R name is most likely something that only Epiphone uses. Those pickups are probably made exclusively for Epiphone by some random asian
pickup manufacturer like Artec or similar. If you really need the stock pickups you could try to get in touch with Epiphone
and ask if you could, and if so, how to obtain them. Epiphone has been more gratious towards selling bass parts compared to Gibson.
Good luck!