Joe - According to a 1929-46 Chevrolet Master Parts Price List it was available for 1937 & 1938 3/4 ton and above trucks equipped with the heavy duty (3" thick) core radiators. There were ones also available for earlier and later trucks with the heavy duty radiator as listed. I'm sure it could probably be adapted to a 1/2 ton radiator too.
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~ Dan
1951 Chevy 3 window 3100
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"My Grandpa Carl's Truck and How it Became Mine"
1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver)
US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)