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The auto counterweight is specific to the engine not the flywheel. The flywheel will work with either an S4 or S5 NA engine but will need the specific counterweight for that engine.
My mechanic tried to install RB flywheel today. It wont fit my 86 rx7 na (S4). He seems to think that this RB flywheel is for a S5? I would like to return it since you advertized that it would fit a S4 and it dosen't. What address should I seen it to?