The keys are fine. Your drop brackets (the cast pieces that plug into your A-arms) are backwards. You can clearly see the "R" and "L" in the photos...and your's are installed backwards. Take it back to the alleged mechanic and tell him to swap them so the "R" is on the right and the "L" is on the left. Speak slowly and clearly...he might be retarded. I seriously don't know what Rancho could have done to make it more obvious. You should be careful letting people work on your truck.
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Also, the t-bars themselves are indexed differently for RH and LH sides AND ALSO FOR FRONT/REAR ENDS. They can be installed backwards and/or flipped....but they will only be correct if they are installed one way.