I donít think the individual parts are available. You would need seals for the front clutch housing, clutch drum to pressure feed, clutch pistons, steel discs, and friction discs. Using RealOEM.com only the complete transmission assembly is shown and the NOT the clutch replacement parts needed.
The complete transmission assembly is listed as:
01 Replacement, dual-clutch transmission GS7D36SG 1 28007842585 $9,749.87
There are new service DCT tools that BMW has released, maybe in preparation for the ability to pull the front M-DCT housing and replace the seals and service the clutches?
The clutches are much like those used in an automatic transmission and should be able to be serviced in the field with the needed tools.