You probably don't have to, but I bought the more expensive trunk struts. They are $50+
Original Part No: 60D03 W321
* Remove Back Trunk Panel
A. Pull Panel away from metal friction clips on top, then sides.
B. Remove 2 plastic friction screws, 1 on bottom left side, other is on bottom right side.
C. Complete, now remove panel from trunk.
* Remove Old Trunk Struts
A. First Remove ball-joint bolt that is near you. Do not worry about nut on other side, it is welded and will not turn.
Tip: Use adjustable wrench, is wider and has better grip.
(Important) Heat wrench on stove, you will strip the ball-joint bolt if it's not heated. Is more safe then having open flame next to your gas-tank.
Tip. Loosen: For driver side; turn wrench down. For passenger side; turn wrench up.
Tip: Keep turning the wrench until the ball-joint bolt is removed, is a tight fit & will take a few minutes.
C. Use flat head screw driver and bend retainer clip. Strut will slide off.
Tip: You only need to bend one retainer clip, not both.
(Important) Install your new strut after you remove the first, trunk door becomes heavy!
*Installing New Trunk Strut
A. Place washer/spacer onto ball-joint bolt.
B. Screw ball-joint bolt with washer into trunk door. Use wrench, no heat this time.
Tip. Tighten: For driver side; turn wrench up. For passenger side; turn wrench down.
Tip: If you're having trouble with the threading; use a socket wrench.
C. Install fare end of strut first. Slide onto bolt past the retainer clips.
D. Install near end of stut into ball-joint bolt.
Tip: Add grease to new ball joint if you want.
Tip: You may need to open trunk all the way, or push down on the strut. You need to be strong, or find someone who is. Be careful, dont let hand slip.
Install trunk panel, clean up.