Interesting reading some of information so far from Tamiya.

The M05 bearing kit comtains 12 1150 bearings !!!! Does this mean going back to 1150 in the wheels?

The rear alloy hub carriers are listed as fitting the M03 as well and will need the 1050 bearings

The front alloy uprights are also listed as fitting the M03 but makes no mention of requiring a 1050 bearing. So would suggest that it will use a 1150 bearing maybe? A bit like the old style alloy upright.

So far a bit confusing. Gives the impression that you will have 1150 bearings on the front and 1050 bearing on the rear if you use the alloy parts