This video helped me replace the Prius lift hatch struts. I bought OEM replacements from eBay (from a dealer). When popping off the metal tabs, you'll have to use a small enough screwdriver head. I found a good sized one in a kit like this:
Copy the video: you'll want to pull the tab toward you, and then push the metal tab up (or down). Be sure you don't mess with the new one: you don't have to pull out the metal tab on the new one. Just pop it in.
