ATS S2000 AP1/ AP2 Drive Pinion Collar　

Car make: Honda
Model: S2000 AP1 / AP2

The genuine telescopic collar attached to the drive pinion shaft is combined with the ATS drive pinion collar and adjustment shim for more reliable preload adjustment, and it has the effect of suppressing the decrease in preload value due to repeated sports driving.

I don't think there's much opportunity to change it if it's only for city driving as it is on the market, but Mazda Roadster and Honda S2000 are weak here, and if you repeat sports driving, you will need to change the color by regular maintenance.