I2C Sonar Matek H743 Wing

Hi everyone. I am trying to integrate 2X DF Robot Gravity Ultrasonic sensor into my rover project running a Matek H743. The sensors are I2C.

I tried every conceivable resource on how to get it working over the DA1 CL1 and DA2 and CL2 pads on the board. I also tried plugging into the TX8 and RX8 pins to see if will work over UART serial 8 and setting the protocol to 9-rangefinder.

Is there an I2C address I am getting wrong or is there something else I have overlooked?
This is the first time I have tried using ultrasonic sensors in Ardupilot, the configurator UI has the rangefinder options greyed out.

Any inputs appreciated.