I've spent a lot of time reading through this website, they are known for having great quality components, and they have some turn signal stalks that basically look like they were made by GM. I believe some people have posted about Rostra in the forum, but I have not found a detailed walk through of the installation on one of our own trucks.
I agree that if you've done an LS swap before something like this would likely be easy, but it isn't something I would tackle without more research.
https://www.rostra.com/universal-aft...-by-rostra.php
https://www.rostra.com/aftermarket-c...ra.php#2503304