My reply was not meant as a "Hey you should shop here" but as maybe Jeff would have a better answer or maybe some pull with the company to realize the issue and correct it.
Then again, maybe powerlet designed the '06 plugs as single units on purpose due to low sales volume on the dual units.
For '06 it looks like you get a choice right/left side rear.
Not that any of this helps you out.
I would be pissed too if that is what showed up in the mail (not what I ordered)