Tony,
I am not certain about your particular model, but fortunately Chevrolet used a very generic brake hose that was used on a myriad of other vehicles. I believe a Wagner F-4497 or Raybestos BH-4497 will fit your truck. All three hoses are the same part number. Same hoses as on my 1941 1 1/2 ton truck.
https://www.rockauto.com/en/catalog/chevrolet,1938,truck,3.5l+217cid+l6,952872,brake+&+wheel+hub,hydraulic+hose,1792
Paul