Just installed the Metricks hood assist kit on my 23 SL. I tried to install it like they show on the video, with no luck.
Not sure if something has changed somewhat in the hinge design. The link arm that they show unbolting would not line up properly. I had to remove the upper bolt also, and remove the entire arm. Then I could install the lower bolt thru the spring and snug it up. Then install the upper bolt and tighten both up.
Still only took 20 minutes to install both sides, but they should make a new video explaining more.
I will say it works great, hood slides open easy, and can be shut without it slamming down.
Hope it holds up over time and use.