I'm thinking about getting this basket myself. Can you still open the sunroof without getting terrible wind noises?

 

I've had some noticeable wind noise ever since I installed the crossbars. Adding the basket did not seem to make it any worse. If I open the sunroof, I'll hear it, but IMO it's not terrible.

 

Could add the extension, thus making the basket more useful...

 

Funny coincidence, I'm looking at a Thule Canyon XT basket on Marketplace right now. The seller does not have the U-Bolts for it anymore. I know we have the same crossbars, but do you happen to know what size U-Bolts were needed for securing the basket? I believe Thule sends 3 different sizes. It doesn't need to be the exact dimension, but a small, medium, or large would do just fine. Thank you

 

I used the medium sized U-bolts. They measure aprroximately 1-7/8" high. (4" wide.)
(* T-bolts can also be used instead of U-bolts.)

If the seller is missing the U-bolts, I would be extremely concerned what else is missing from the installation kit. It has several specialized pieces to it (see below).

The full Thule XT Canyon Installation guide is available at: https://www.thule.com/-/s/approved/std.lang.all/38/94/463894.pdf

etrailer.com does sell an overpriced installation kit, but be aware, it is not complete.