The file '2WD Chassis Infrared Sensor Holder/Mount With M3 Holes For Arduino 3D Printer Model' is (stl) file type, size is 11.8KB.
A mount to fit onto the 'standard' 2WD Chassis Kit seen on Amazon, AliExpress, etc. to be able to mount 2 - 4 Infrared FC 51 sensors.
Uses M3 screws to mount to the chassis and the infrared modules
https://www.youtube.com/watch?v=nxx1h5k6dqQ