The original pilot bushing is just a metal sleeve that the transmission input shaft slides into. These sleeves usually get worn out, and leave shavings inside the bell housing....
WASHER-ADJUST is Lookup Code 38453Y in the diagram.
Nissan OEM Clutch Line Hose Bracket - Nissan 350Z 370Z / Infiniti G35 G37.
Torque Solution Billet Transmission MountApplications: Nissan 370z / Infiniti G37
This is a must have upgrade for the 350Z with an upgraded clutch. This will eliminate the mushy pedal feel, that ALL Z's have after installing high clamping force clutches.
BOLT is Lookup Code 08146-6122G in the diagram.