Hi Bob. The two steel plates in line with the frame are what the tool box sits and bolts onto. It's four 1/2" unf bolts that screw into the smaller holes. The big ones are there so the plate clears the frame rivets.
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Jordan Baker
RHLI Museum,
Otter LRC
C15A-Wire3, 1944
Willys MB, 1942
10cwt Canadian trailer
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