Cmp tool box

[TCLARK]

I have been restoring a 1941 C15 Cab 12. I am about to start on the body as I have the chassis motor etc. finished. I have a box believe its a 1B1style as pictured. This is not my truck. I need to build a tool box and could copy this one belonging to a friend. Would my truck have come out with this type of tool box or a later on with spare tire in the middle? Any help would be appreciated even from Bob C HI Bob!
Thanks Terry