Hello @Karen_De_Paep 
Welcome to the Creality Forum…! 
Unfortunately I’m not sure what the pitch (distance between pins) is of that JST connector used in your printer as Creality uses both. What is the model printer you have and maybe someone will recognize the size. You could start by searching Amazon for:
JST XH 2.54mm 3 Pin connectors like these:
or smaller pitch like the JST 1.25mm 3Pin Mini Micro: