Yes. Systems are available from
RMC and from
GraphTech.
HOWEVER.
There is another option. The Roland GK-KIT-BG which is the internal version of the GK-3B which is indeed big and nasty looking.
I installed this into my Surine bass and as you can see from the photos it doesn't look very bad at all. And it's quite a bit cheaper compared to the piezo systems.
I have the GK-KIT-BG in my two six string basses: the
Surine and the
Benavente fretless, and the system works quite well both with the V-Bass and the GR-20. I also have a
Conklin bass that has the RMC piezo and poly-drive system, and although it has too many strings for the GK system it still seems to work quite well with the V-Bass. But I haven't used that one quite as much as the six-string instruments.
Note that the Roland GK-KIT-BG may not appear on the lists that Roland dealers have - it doesn't here in Norway at least. But it's still available for ordering. Make sure you order the -BG version otherwise you'll get the
guitar kit.