Mine came with just ONE of the moldings. I didn't notice until the day after I brought it home (you don't usually look at both sides of the car at the same time
I figured it would be easier to add the other one than to remove one and leave a mark. So I had them order one and install it for me.
At the time, I had seen a lot of '05 V6s with the molding, so I figured it was a V6-specific option (I have yet to see a GT with this).