I got YR center driveshaft and center outdrives for the diffs, whatever you call those, at the LHS a few weeks ago.
80% of the parts in his Tamiya bin full of parts is YR. I seen some official Tamiya stuff but they were mostly for M chassis.
This was at the family owned shop. He used to have a track a few years ago. He raced lots of TT02s and M classes way back when. Like in 2017 so some of those parts aren't the newest. But the chassis are still the same so it doesn't really matter.