FITS optical image of M31

[Thomas Dame]

Does anyone know where I might find a good optical image
of M31 in FITS format?  The Digitized Sky Survey on SkyView is
a great service, but that image does not show the dust
lanes as well as some more recent (non-FITS) images I have seen.
I'm especially interested in an image that shows the dust
lanes well because I want to overlay recent CO observations.   

Thanks,

Tom Dame