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The Eibach ERS 2.50-inch ID helper spring is a coilover accessory sized for a 2.50" inner-diameter seat. Intended for use in ERS-style assemblies, it supports the main spring to help preserve ride height under variable loads and reduce coil bind. By assisting spring preload and stacking, this helper spring helps maintain consistent suspension response during frequent load changes or lowered applications where additional support is needed.
Eibach ERS 2.50 in. ID Helper Spring
