Yes they are Delrin bushings. I did one side last night with the strap just like this. I had to get the car out of the garage for another weekend project so I’ll get to the other side sometime this week.
Yep, so with Delrin bushings you can tighten them whenever. Tightening at ride height is specific to the factory rubber bushings.
I had great luck with the additional strap, I run tubular LCA's on my Duster now but I add plates and straps to factory LCA's if I do them, just to keep the end of the LCA from spreading apart any under load.
