Try the nickle trick before buying new. Remove the "helper," remove the boot from helper, add nickle (or other coins/washers/&c) to bottom of boot, re-install boot, re-install helper. Getting the boot off can be a bit of a PITA but the second one will go a lot easier. I did this while waiting for warranty replacements.
If you are replacing the helpers on the hatch with new ones, it's a super easy DIY. Quarter-turn to remove the old ones. Quarter-turn to install the new. No sense paying a dealership to do that.
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