I use ISTA (dealer software) and can pull it by VIN. However you can use other places like bimmercat below but it's mainly for older vehicles. Your 2021 is close enough to 2020. The best thing to do of course is to call the dealer and give them your VIN and they can tell you what to buy and how much of each.
Front:
https://bimmercat.com/bmw/en/search/...iX/USA/31_1559
Hypoid G2 has been replaced by G5 after 03/2020.
Rear:
https://bimmercat.com/bmw/en/search/...iX/USA/33_2304
Hypoid G4 is used in the M sport rear diff.