Joe this is what I found under that part number... it looks to be a high used part.
Carrier, Cargo, Amphibious, Tracked, M116 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Carrier, Cargo, Tracked, 6-Ton, M548 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...