For most factory/OEM racks we recommend the standard clamps. See the selection tool for exceptions.
clamp size guide
Tan the large size clamps on 1” square tubing on my yak trailer and they worked great until I had to add another kayak to the trailer. I then moved up to the CL and they were a perfect fit for the Thule aero blade. Keep up the awesome work!
The clamps are solid and very easy to use. I would also highly recommend the lock body kit accessory to upgrade these clamps, they are sweet!
I had to get the large clamps for my Frontrunner rack crossbars. They fit perfect.