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The rear upper control in the top of the
picture is a stock 10 Bolt
control arm.
The rear upper control in the bottom of the picture is a stock 12
Bolt control arm. As you can see, the 12 Bolt arm is
notched and reinforced below the bolt hole.
These control arms are the same for all 1968 through 1972 GM A-Body
cars.
This picture shows a close-up of the 10-bolt upper arm.
This arm is exactly the same as the 12-bolt
arm but it was not ground down and not reinforcement plated has been
added.
I can modify your arms to create a 12-bolt arms for you
(see the
process)
This picture shows a close-up of the 12-bolt upper arm.
This modified arm was only on the drivers side. There were no
clearance issues on the passenger side.
There's
a reinforcement plate spot welded over the hole from the factory. This
was done because the 12 Bolt rear end chase is larger then the 10
Bolt rear end. The arm was ground down to create clearance needed
for the rear end, the plate was spot welded to the arm to restore
the strength.
