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Elite Rotary Shop Knock Sensors Studs CNC Machined For A Perfect Fit. Our studs start out at 10MM to thread into the rotor housing, Then are machined down to 8MM for the knock sensors to slide on too. No more riding your sensors, 2pc set available on our website Mazda rotary engine specialists - Elite Rotary Shop in the Elite Product category $18.99
Bosch knock sensors with 8mm opening, yes they will work on all 13b and 20b
That look like a RX8 style knock sensor, I know for FC and FD uses a single wire block style sensor. I wonder if that style sensor works with FC and FD.