User BenjaminLSR of the Rochenoire team released a 2.4.3 .exe file which mimics the vanilla client in terms of item caching.
This means that you don't need any custom MPQ files or other tools as wowme to add custom items to your 2.4.3 server anymore.
I also copied the image of the modified bytes so this information doesn't get lost:
Original Reddit post:
