Glad they seem to work out nicely for you. I was not able to locate them at my local dicks sporting goods, which I think is going out of business, so I will have to find a different one. I could've bought them online with the link you provided, but I looked around a lot at other options as well. I ended up going as cheap as possible (which I didn't want to do, but I did) and getting ebay kayak j racks. Figured I would save a lot of money buying those for now since I have other things I want to buy at the moment as well but I really want to get out on the water at the same time! Also, just an update for my noise, it is really not as bad as it first was. I had my neighbor (who works at a GM dealership) check them over and made sure I put everything on right. After a little bit more tightening them down, the wind noise is still there but only barely noticeable when the radio is off.
For you or anyone reading this wondering about ebay kayak j racks (the cheapest ones): the quality seems fine. You kind of get what you pay for. If you leave the j racks on your car all the time, I feel as if they will get crappy really quick. However, putting them on the rack and off takes no time. They seem sturdy enough, but you will want to upgrade straps. The provided straps are good for short trips, but I would invest in better quality ones for longer trips. As far as fitment on the GM racks, they fit, but they are meant for round bars. I would recommend making your own metal plates that are flat for an exact fitment or finding someone that can make them for you. But they work good enough out of the box if you are just dying to transport your kayaks. Overall, I would recommend ebay kayak j racks if quality is not your main concern and you just want something cheap that works. Hope this helps for anyone reading this that has questions!
Also, thank you for helping me out as well timjgallagher11.