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I baught a m56 a few monts ago started sanding and found the hood nimbers but cannot find the bumper numbers. this is the information I have.vin/frame #2668011736 hood number is 2408690 and plate info is m56 b1 fed stock #2320-542-4633 contract #da-20-018-amc-06821 mf ser #11736 del 7-63 model is t-245 or 1-245 I would like to get past info about the truck

You have about all you are going to get, the bumper info is the using unit's ID and when removed there is no way to recover it unless you are lucky and happen to sand into it.
The army did not keep those type of records permanently and the info was lost when that page of property and log book was destroyed when the trucks were turned in to property disposal for sale.

I do not think I will be able to get the numbers of the bumper