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On 1977-1980 GM 10 Bolt front axles, the Caliper Support Plate/Brake Shield assemblies will vary by both year and model. For the Caliper Support Plate/Brake Shield assemblies, 1/2 ton and 3/4 ton parts are always different as the 3/4 ton trucks have a larger diameter rotor. From 1977 and 1978, both left and right Caliper Support Plate/Brake Shields assemblies are the same on both sides of your axle. Effective with the 1979 model year, left and right Caliper Support Plate/Brake Shields assemblies are different.
