Yes, I reused the factory links. That doesn't automatically make them the "weak point or limiting factor". Unless the engineer(s) that designed the parts can comment, for all we know the best part of that rear anti-sway system are the links. And to be honest for how much this does for the ride quality and handling (huge difference), if you installed the bar first, and then found factory length aftermarket links and installed them, I highly doubt you would notice a difference between the links.
Not all aftermarket products are "better" than the OEM ones. Sometimes they are just a part that is designed to replace a factory part to be able to install other components and could actually be worse than the OEM.
Simply put, I installed the rear sway bar and then I took one of our techs for a ride right after. He bought his Limited a week after I bought my Laramie. He was ordering his sway bar while we were still in the truck and not back to the shop yet.
It is a huge difference. So much so that if I was richer than rich, I would tell everyone to buy one and if they didn't like it, I'd pay for it... It really is that much of a positive difference.