Our USA made custom 2.5" urethane coilover spring isolators are used in our coilover shock mount/bump stop kits and are designed to work with 1999-2005 NB Miata Shock Hats. They will NOT work with 1990-1997 NA Miata shock hats! They might also work with other shock hats, but we haven't tested them on anything besides the 1999-2005 Miata shock hats. The purpose of these is to center the coilover spring within the shock hat.
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