If you don't have any luck (and the item has been out of pruduction for some years now,
AFAIK), you might try and make one. Or get your local tech to make one up for you.
The details of the connections are outlined here:
HACKING (about half way down the page, in the 'Panasonic Cameras' section).
The RS232 socket is a standard item from any electronics component supplier, and you can probably cut the RCA sockets from a standard AV lead, and just use the multipole jack plug and cable . Any tech should be able to work out the right leads to be soldered OK.
Not ideal, but if nobody has one going spare, it gives you an option to try.