Pretty sure you use the counterweight that matches the flywheel (13B flywheel=13B CW).
Otherwise, it is a common upgrade. I think ALL of the guys local who rock 12a's have a 13B clutch set up in them.
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1976 Mazda Cosmo RX-5
1976 Mazda Cosmo RX-5
2003 Toyota Tundra TRD
2015 Toyota 4Runner SR5
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