im pretty sure there would be a brand name or marking on the back side of the spindle. get a flashlight out and check it out. or just find a pic of a stock spindle and compare it to yours. if yours is higher, then there is your answer.
also true for the smaller diameter rim not fitting. it would hit the control arm. not sure about your body but the trick for the OBS trucks was to notch the control arm to allow the smaller rim.



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