Yes, they did change the design from fixed pins to cables and pins, that was done to relieve stress because the replacements are taller into the opening and there isn't much of any slack on the truck harness side, so that makes for less stress on everything, it is a good upgrade. I do not know for sure if there is a polarity to these lights or not, but I would simply attach the pins straight to the connector when it is in the orientation that the original lights attached to it without any crossover. I do know that that is how they were designed to be connected/installed. Mine are the original design with the fixed posts and the new ones are easier on everything due to the flexibility of the cables compared to those fixed pins. Last but not least, you may have to apply some upward and outward pressure on the spring clip to get it seated into the socket, I used the little screwdriver supplied to push up VERY CAREFULLY so it doesn't slip, but I also know they made a small change in the mold design to have it fit easier more like the originals do, but I have not seen any feedback on that design change and if it made things a little easier.