Side-Step Differences for Early and Late TJs?

I thought the early ones had nutserts in the frame that bolts went into.

Later had the U-shaped bolts that you maneuvered into the inside of the frame so they were sticking out. Then nuts when into those.
 
Here’s the newer ones. I think they also have a hook in the mounting bracket that goes into slots on the frame. Not sure if earlier ones have that or not.

7D5D9B33-214A-4734-B19B-36EE1B1EF580.webp
 
  • Like
Reactions: SSTJ