2 S2000s here for similar work.

One gets an OEM clutch and the other a SOS clutch kit.

Either way, it's important to replace the components when changing the clutch.

The Install kit is a must:

https://www.lhtperformance.com/produc...

Also a good idea to perform a Shift rebuild:

https://www.lhtperformance.com/produc...

For the 2000 to 2005 Change and upgrade the Drive Shaft Bolts:

https://www.lhtperformance.com/produc...