The Server Ninja, The C1100 drive carriers only look to be compatible with the C1100 and the C2100. The R610/710 have similar carriers to each other, but are a totally different style from the C1100's carrier.  Let me know if this answers your question.
Wanted to take out drives from my current system C1100 and put into an R610 or R710. Do Hard Drive Trays from C1100 fit in and work with R Series Servers? Thank you The Server Ninja
C1100 Hard Drive Tray Compatibility 