How does it drive? how does it ride?
You need longer bolts!! That bottom bolt (second pic) looks too short and doesn't look like it's engaging the nylock properly. Also, I prefer pinch bolts to nylocks on suspension parts, they work better in greaseable applications.
If you're looking for recommendations, here's mine:
I tried 5½" shackled on my rig, I didn't like the way it handled, I put the stock 4" shackles back on, much better again.
I did reuse the greasable bolts though, I like those. Poly bushings also help, and I keep the pins kinda loose to help with ride and articulation.
Buy a new shackle kit, keep the length 5" or less. My personal preference ( based on my limited experience) is stock length 4" shackles.
...unless you like the way it rides, in which case →Replace the bolts and Send it!