How to set alternate printer driver selection ?

I need to configure a Lexmark Z11 using the lxm3200-tweaked driver. It works under Ubuntu 5.04 on lp0, but I want Knoppix. I can't select an alternate driver under Knoppix > Configure > Configure Printers (cupsconfig). Choosing "Lexmark 3200 (Foomatic+lxm3200) [recommended]" ratchets the print head against the side of the printer stripping the drive belt. Choosing "Other..." driver I can't find a way to tell it lxm3200-tweaked, even though the .xml file is in /usr/share/foomatic/db/source/driver (it reports a bad format if I navigate to it). What am I doing wrong ?

Thanks !