Locating install printer PPD driver url script
You can get information about the installed printer driver with system_profiler:

pse@Mithos:~$ system_profiler SPPrintersSoftwareDataType
Printer Software:

    PPDs:

      PPDs:
          Path: /Library/Printers/PPDs/Contents/Resources/CanonIJMG7100series.ppd.gz
          Version: 11.7.1.0
          Path: /Library/Printers/PPDs/Contents/Resources/CanonIJMP520series.ppd.gz
          Version: 10.84.2.0
          Path: /Library/Printers/PPDs/Contents/Resources/CanonIJMP540series.ppd.gz
          Version: 10.84.2.0
...