Trust/Greddy makes a set of pulleys, all *bar* the the main crank (I assume for the risk/perceived risk of the balancing issues discussed).. Favourites nengun have them for approximately $300: http://www.nengun.com/product_info.php?cPa...4694af6628dcbea
I guess the main one everybody has been talking about is the main crank pulley, however I feeling trust would have invested a bit to see whether it was safe enough to reliably put on a stock balanced RB engine and the answer was no. For fitment, I assume they are same across RB25 and RB26, seeing as everything around this "area" is pretty much transferable (water pump, timing belt, ex. and inlet cam gears, even the cam cover)