The machined plates have been available as part of the complete ball diff kit TLR232000 but if the manual is stating TLR2955 for the outdrives alone then I suspect it's been introduced as an interchangeable running change which means there will be mixed stocks of the old and new versions for a while.
Functionally there is little difference - I've not noticed any performance difference between the machined and non-machined outdrives but theoretically the new ones will be flatter.
I'm happy using either - I have one of the 'new' diffs and one of the old (i always carry a spare) and I can't feel any difference once they're both run in and adjusted correctly but maybe I'm just getting old ;-)
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