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The repair TM for this is
TM9-2320-218-20.pdf
Section XVIII
Page 2-176
The parts TM for this is
TM9-2320-218-34P.pdf
Page 182
A source for the part is Army Jeep Parts ( there are probably others also)
https://www.armyjeepparts.net/p-1356-universal-joint-m151-drive-shaft-small-5707186.aspx