im using a ross balancer made to suit rb30 and rb26 pulleys...... i think you can look them up under ross balancers in blacktown sydney NSW
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ROSS TUFFBOND BALANCER FOR RB26DETT
A MUST FOR ALL SUB-11 SECOND GTR'S
2 PIECE WEIGHING ONLY 3.3KG COMPARED TO THE FACTORY 6.2KG
ANDRA APPROVED