SPEC Billet Flywheel Nissan 240sx 89-98 KA24. Light Weight 17lb Billet Steel flywheel. This flywheel has a new added feature that has both the KA and SR pressure plate bolt holes. Meaning it can use an SR clutch for more holding capacity than the KA size. Designed to be re-surfaced many times before discarding, extending flywheel life dramatically.