ST Install Question; Rear Shock upper nut

Looking to install my ST's soon.



For those w/ST Coils, which nut did you use on rear shocks? ST, or BMW?



ECS Tuning install video notes that you should NOT the one provided by KW.

They recommend you use a BMW Nylox(?) nut which has a bushing,

Plus they note that BMW recommends a new nut/bushing w/every installation.



Did you guys just re-use the BMW nut/bushing? Purchase a new one from dealer?



Thanks for input.