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I have seen the military use the same square hole bracket attached to the tool box as a storage for the mudflaps.The mud flaps are a kit added to the tractors. It also consists of rack/holder on the tool box so they can be pulled, removed and stowed away.
one is available on epay at gold price. search numbers below.
US ARMY P/N - 12300848
NSN - 2540-01-281-9855