The kingpins are left and right.
Is your axle straight? Here is how to check-
Front Axle
The king pins should also be snug in the holes of the axles. Some have been run loose and will not lock in tight if they are worn.
You may also need some spacers if the spindles are worn on the top where the bearings go. When assembled they should not have up and down.
The wish bone should be snug to the axle too. Some are worn there from being run loose.