[wdb]

EDIT: I began this thread asking for advice about what else I should do while I have several big bits pulled off the underside of my car. It's turned into one of those ever-expanding projects so I've changed the thread title. Here are the bits I replaced.
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My Z4MC has about 83K miles. It's had regular maintenance throughout its life including transmission and differential oil changes. I have all the bits pulled off underneath so that I can install a short shift assembly, RE X-pipe, and RE transmission mounts. The driveshaft differential seal is also seeping so I plan to drop the driveshaft and deal with that. Oh and I'm not thrilled with the clutch operation and bleeding didn't change anything, so I may pull the gearbox out. (EDIT: I did.)

DRIVESHAFT
- driveshaft guibo
- driveshaft center bearing
- new hardware as indicated by newtis.info

REAR DIFF
- input shaft seal
- oil change using BMW gear oil

CLUTCH
- OEM or equivalent disc, pressure plate, T/O bearing, pilot bearing
- OEM equivalent dual mass flywheel
- all new hydraulics
- SS flex line (overkill maybe but it came in the kit)
- new hardware as indicated by newtis.info

SHIFTER
- Auto Solutions short shift kit (I used the blue bushings)
- OEM rear shift rail mount
- OEM transmission mounts

WHAT ELSE
- Vibra-Technics motor mounts (road version)
- new bolts for aluminum reinforcement plate under engine
- new bolts for steel reinforcement plate under center of car