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...The wider Alto band (left) maintains proper Servo hole, and the OE band (right) is egg-shaped from normal use. The Alto band (top) is wider and maintains a grippier friction matrix.
Red Dog 6 - Technical Article - Chevy High Performance Magazine

...The wider Alto band (left) maintains proper Servo hole, and the OE band (right) is egg-shaped from normal use. The Alto band (top) is wider and maintains a grippier friction matrix.  View Related Article