Find the specifications of your current Motherboard. Find a CPU that has the same operating specifications as the motherboard. It is that simple!
Here is the spec sheet for what you HAVE. https://www.intel.com/content/www/us/en/intelligent-systems/huron-river/core-mobile-qm67-hm65-platform-brief.html
Now you need to get the specifications from there, and find one that has the same specs!