Cm-R or Gm-R cassette?

[t.barnett at path.utas.edu.au]

Hi,

I am after a chloramphenicol-R or gentamicin-R cassette for the
construction of a cosmid vector for use in Aeromonas spp.  The vector I
have is Amp-R Tet-R but these markers aren't suitable, neither is Kan-R. 
The sites I have available to clone into are PstI, ClaI, HindIII or SalI.

Thanks in advance,

Tim Barnett