Lets clear this up once and for all! The rear covers were left off because the covers were on the front for a purpose: to prevent dust from getting in the bearings. The rear bearings were not exposed to dust By design, as the fronts were, consequently they (the covers) were not used on the rear. The red "Balls" were actually the dust caps painted red to provide a "Target" for the pit crew to aim for when changing a tire during the heat of the battle, that trick is still used by some of the Cup & Busch teams today. So make a choice, justify it by whatever means you will. They were on the front only for the above reason, no other!
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