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The kingpins are definitely different. Midget kingpins are 0.813" (13/16") and sprint car pins are 0.859" (55/64"). I believe midget spindles are patterned after early Ford (Model A?) parts while sprint car spindles are based on mid-60's Ford Econoline van/pickup units, though racing spindles have 10 degree inclination while OEM parts are 5 degree.
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