I stand corrected, at least as far as the E93 is concerned! Maybe it is only the E92's that lack rear seat cup holders and the OP does have an E92...
2011 Space Grey E90 M3, DCT, Comp. Pkg.
1997 Z3 2.8, Artic Silver, Tanin Red interior, MT
1974 2002tii, Inka, 5 sp manual