The RS-R lowering springs for the 2021 Toyota Mirai (JPD20) FCV offer a direct-fit suspension lowering solution specific to that model year. These springs are intended to alter ride height from stock and provide a tailored stance for the Mirai; they are listed as fitment-matched parts for the 2021 Mirai application.
RS-R 2021 Toyota Mirai (JPD20) FCV Down Sus Springs