SIK pinouts for F405 wing FC

New at telemetry.Trying to figure out the wiring for the Matek F405 wing controller with the SIK radios. On my Matek flight controller each uart seems to have 4 pins, and the SIK radio module has six. Do I need the CTS/RTS pins, and if so, where do they go?
Thanks very much.
Jim

No, just leave them unconnected