Tein coilover racing springs with a 58mm inner diameter and an 18 kg/mm spring rate are sold as a matched pair for coilover assemblies. These springs are presented by inner dimension and rate for customers matching spring specifications to their coilover hardware, with the listing focusing on the spring dimensions, rate, and pair quantity rather than vehicle-specific claims.
Tein Coilover Racing Spring I.D. 58mm Spring Rate 18kg/mm (Pair)