Here is the set you are looking for. This was included with the trucks until 1948. It was available after that from dealers into the task force era. Tools were supplied by Vlchek and McKaig-Hatch
http://good-times.webshots.com/photo/2765681840102454676towdWXWrench sizes are 3/8-7/16, 1/2-9/16, 5/8-3/4 from both manufacturers.
1941-48 original sets come with an adjustable wrench you can see in some of my pictures it says on the handle, MADE IN USA 9 Auto (for 9" long). Tools can be natural finish, black or cadmium plated.
Expect to pay above $300 for an original set in the box.
