I haven't compared the Ford and Chev parts lists to see if the numbers for the main unit (without elbows, filters etc.) are the same but can tell you that the C60-X uses a different booster (with linkage mounted external reactionary valve rather than the internal valve used by other Chevs) on the early trucks and an entirely different system on the later ones. The F60-H has another, completely different brake booster system.
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