Not sure exactly what files do you have but at least on my system:
ppd files can be found in /usr/share/ppd/cupsfilters if you want them grabbe dby Cups.
icc profile files can be found in an adequate directory within /usr/share/color/icc. Which directory I guess depends on what and who is managing those files.
paper definition files (size, margins, etc) go into /usr/share/gutenprint in a directory within usually with the name papers (note the plural).
Now, all this gets me is where to place the files. I wouldn't know exactly how to register to eg.: Cups that those files are there other than using Cups's own web interface to add drivers.