Hi @steven101979
Here's a [https://www.youtube.com/watch?v=pRM4TOh-g5I|video] that may help.
At 2:46 minutes in to the video it starts the removal of the heatsink assembly, which includes the fans.
At 4:16 minutes the assembly is turned over which allows you to see part information stickers on the bottom of the fans which is useful when ordering parts.
When searching online for [https://www.google.com/search?client=firefox-b-d&q=MSI+Raider+GE66+12UGS+heat+sink+assembly|MSI Raider GE66 12UGS heat sink assembly] (examples only), there are lots of suppliers, but knowing the part number information from your heatsink assembly will ensure that you get the correct ones, just in case some are different.