I finally got around to racking the PC-1600 today.  I had a set of Emu Esi
sampler rack ears lying around and decided to mount them on the PC-1600.
These ears are available from Emu for $20 and best of all, they are black
(or very close).  I have attached a pic of the job.  It is not easily seen
in the picture, but I put a single washer between the ears and the PC1600 in
order make the spacing for the rack.
Later!
Mike Goins