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Should work just fine. I just did that exact same thing with my Rx-4 engine. I put S5 NA rotors into an early 4 port engine. I did use RB one piece carbon apex seals though, but I'm sure OEM ones would work fine as well. Good luck with your build.
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1976 Rx-4 hardtop. Half bridge 3B 13B, S5 NA rotors, Renesis e-shaft, stat gears, and bearings, balanced rotating assembly, RE dual weber 36 DCD's 203rwhp 137ft-lbs torque DGRR 2011 3rd place
1974 Rx-4 all original 27,000 miles
1988 Rx-7 TII 320rwhp. DGRR 2012 3rd place
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