All of the '60-'66 Chevy light-duty trucks (C10 & C20), had trailing arms/coil springs rear suspension assemblies. The GMC trucks of the same years, had leaves, as standard equipment, in the rear. The 1/2 ton front & rear coils are lighter than the 3/4 ton front & rear coils. The torsion bar front suspension systems in '60-'62, did not have coils on the front. Perhaps the vendors acknowledge this when providing the description for the rears? I believe the 1/2 ton rear coils are interchangeable from '60-'66.
