71 Demon Bucket Seat Track Connecting Cable

The latching levers rotate on a pin so pulling at a angle rotates it much better than a straight away pull. That and the threaded eye screw for adjustment allowing open tolerances.
I don't recall ever seeing a two separate track assembly that didn't have a latch on both. A free track would allow seat to rotate to some degree in a collision. I wouldn't want my seat to turn me toward the a-pillar post.
Whatever DOT will let them get away with and what safety rating the mfgr wants still applies in todays models.