Bob, regarding the tool box mounting on the 2B1, if you study some of the pictures, the bottom of the tool box is at the same level as the top of the longitudinal sill under the main box. On the 2A1, the longitudinal sills run full length of the box and tool box so when the box isn't installed on the truck the tool box is still in place. I imagine the 2B1 was the same before some farmer or the like got hold of it. (Just before posting this I looked at a drawing in Gregg's Military Vehicle Profiles and it doesn't have full length sills so?)
These pix show the U bolts on the 2B1 on a Cab 11 F15A. The 2 wheel drives have a wider frame is why they made those sills that way. You just use the other holes in the sills and the top flat iron sticks out on the outside of the frame instead of on the inside. In my body parts list the first type 2B1s used U bolts on the tool box and the later types used J bolts. Yours being a Cab 11 it should be the first type so should use the U bolts the same as on these box pix. Is your box originally off your truck or what?
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1940 Cab 11 C8 Wireless with 1A2 box & 11 set
1940 Cab 11 C8 cab and chassis
1940 Cab 11 C15 with 2A1 & Motley mount & Lewis gun
1940 Cab 11 F15A w/ Chev rear ends
1941 Cab 12 F15A
1942-44 Cab 13 F15A x 5
1942 cab 13 F15A with 2B1 box
1943 cab 13 F15A with 2H1 box
1943 Cab 13 C8A HUP
1944 Cab 13 C15A with 2C1 box
1943 Cletrac M2 High Speed Tractor
MkII Bren gun carrier chassis x 2
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