It is saddle pack!
I have got access to the parts list and under the category spares the number for the complete geardiff is 49364700.
You may be referencing preliminary data...how, I won't bother asking...but based on the information I have, this is not the correct number (Note that it also does not match the standard Xray part numbering scheme)...
Please just be patient, the team will be releasing information very soon as they are just finalizing the data.