I know it's a common mistake, but 1955-1959 Chevrolet trucks were Task Force models, like 1941-47 were AK Series / Art Deco models and 1947-55 Advance Design ones. Apache, Spartan and Viking were the names used only for 1958-1959 Task Force trucks (see here for Vikings and here for Spartans) and only for 1960-1961 C/K ones.
So 1955-1957 Chevrolet light- and medium-duty trucks (seems not to be any Spartan model in IMCDb) souldn't be called "Chevrolet Apache" or "Chevrolet Viking". They were just 3600 (or 3100?) to 10800 Task Force models.

I think it could be better to rename all 1955-1959 trucks Chevrolet Task Force, with an Apache/Viking/Spartan complement for the 1958-59 models.
Same thing for the 1960-1961 1st gen. C/K-Series trucks : 1960-61 Chevrolet C/K-Series Apache/Viking/Spartan.
So all 1955-59 Task Force trucks would be together, and same thing for the 1960-66 C/K-Series too
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Same general idea: Chevrolet stopped using the Apache (& Co) name with the 1961 MY. So these 3 cars have a wrong ID:
http://www.imcdb.org/vehicle_50016-Chevrolet-Apache-1962.html
http://www.imcdb.org/vehicle_50246-Chevrolet-Apache-1962.html
http://www.imcdb.org/vehicle_316819-Chevrolet-Apache-C-10-1963.html