Used to add progressive rate to your linear race spring, Four different durometers (60D - 90D) available, Fits springs with 2.5" to 3.0" inside diameter. Four different Spring Rubber durometers (50D - 90D) available for desired rate tuning. Spring Rubbers are used to add progressive rate to your linear race spring. Adds approximately 1.5" of solid height to your spring. Fits springs with 2.5" to 3.0" inside diameters. Made in the U.S.A. and sold individually. Vehicle Fitmenttable.fitment-table-managed, .fitment-table-managed th, .fitment-table-managed td { border: 1px solid #ddd; border-collapse: collapse; padding: 4px 8px; text-align: left; font-size: 14px; } Years Make Model Trim table.productattributes, .productattributes td { border-bottom: 1px solid #ddd; border-collapse: collapse; padding: 2px; text-align: left; } Air Freight Prohibited: false Not Carb Approved: false Carb Acknowledgement Required: false Ltl Freight Required: false Prop 65: Y Part Type: automotive Epa: N/A Regular Stock: false Units Per Sku: 1