Operators, be careful ordering a taillight for your M915A5 tractor. Item 1 of Fig 103 in TM 9-2320-426-13&P (IETM EM 0308, Aug 14) shows it as stoplight vehicular, NSN 6220-01-550-1339. That’s wrong.
To get the taillight, use NSN 6220-01-544-5789.
Jot this info down until the TM is updated.