Hey Steve,
What brand... ATI http://www.atiracing.com/
Where to get one...
Aussie Stock, if you want it soon
CJ motors - contact Jackie
If you dont mind the wait..
Summit Racing
Horsepowerparts
You can run a Rb26 balancer on your Rb25 but it will require a few mods. see below..
http://www.skylinesaustralia.com/forums/Fi...amp;mode=linear