Main bearing 0.50 mm pair with reference number 836119457B, V-836120327, V-836655537 fits for instance HYMAS 470, HYMAS 474, HYMAS TM9. See all compatible models under the Fits to tab.
Install the sliding bearing half with the oil holes/oil grooves facing upwards in the cylinder block and the sliding bearing half without holes/grooves facing downwards (these replace bearings that had grooves and holes in both halves).