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Google search brings up 57K3220 is NSN 2540-01-429-9903. The only info I can find, it is seat modification kit for seats in an ambulance or a truck with a shelter on it. Hopefully someone else can figure what is in the kit.
I have installed the seat modification kit (57K0290). It was not that hard, just a lot of work removing rivets on the drivers side. The passenger side was easy. You made small cut in the battery housing, add reinforcing plate on the back, cover plate on the top of the fiberglass cover, and...
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