Hi
I'm not sure where you are in the world, your profile doesn't provide much info. You might want to try Overwater basses they do their own line of strings for longer scale basses. The strings are pretty good and reasonably priced (at least in the UK).
http://www.overwater.co.uk/bass_guitar_strings.htm
Of course there are other options including of course Fodera, again great strings and able to put together sets to your own specs if required.
http://www.fodera.com/strings.html
These are just two that I have personal experience of dealing with.
Cheers
Nick