According to my Hollander book, the same front wheel cylinder was used from 1937-1950 in most US trucks from half ton thru 2 ton.
1950 was the last year for Huck brakes in most US trucks but obviously your truck has them. I'd guess the new cylinders you found would work for you for the front if they will mount. I am guessing this because the bore is the same.
However, I would try to find the '37 to '50 half ton one somewhere before I'd order the Chevsofthe40s one.
