One of my clients has an old Ricoh Aficio MP 4000B that we are trying to get a bit more life out of. We would like to enable printing - I already have the memory and hard drive, but I need the Printer Unit Type 5000 SD card (we can probably jury-rig the front panel button if we need to). I know this copier is really old and I can't find this Printer Unit SD card anywhere. Any leads would be appreciated.