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HARD Stiffness Bumpstop, length 58mm. Most popular with our stock class autocross customers because you can't change springs for stock class, but you can legally run these taller stops (which effectively raises spring rate legally). Stock class customers often use these in the rear and the medium stiffness 58mm in the front, to help balance the car when using our large front sways (stock class allows changing just ONE sway, not both).