The Eibach ERS coilover spring with a 3.75-inch inner diameter provides a coilover-compatible spring option where that inner fit is required. It supplies the nominal spring element for coilover assemblies specifying a 3.75" I.D. and should be matched to the rest of the suspension kit. Confirm intended fitment with your coilover or vehicle specifications before installation.
Eibach Silver Coilover Spring - 3.75in I.D.