The 1968 driver side ball-joint/lower control arm (straight unit).
This was the problematic unit installed on the early BO29 and LO23 Hemi
Super/Stock cars.
It was replaced by the angled-arm unit.
This straight unit did not allow for proper trajectory of the steering,
as the cars would tend to over-steer at high speeds.
The later cars were equipped with the newer units.
The angled control-arm/ball-joint units would slow the steering..
The early cars shipped out with the straight arms, were later shipped
the new angled units that were to be retro-fitted.
Not everyone replaced the straight arm units....
pc