Thule Summit roof box, what mounting kit?

[Flyingfish]

I am having trouble finding a mounting kit for a older Thule Summit roof box for my 4th Gen. Thule has responded via email "try the QM3 kit" but I didn't want to order the kit to find out it doesn't fit. Does anyone have any personal experience mounting a Thule Summit to their factory rails? Thanks for the help. 2007 Limited

 

[txclimber]

I have the Thule Adventurer, so yours may be different, but another thing to keep in mind is clearance. If I mount mine to the factory bars it can't be positioned far enough forward to allow the rear hatch to open. (I have the hump back spoiler, which exaggerates this.)

I had to use aftermarket (yakima) crossbars so the box sat a little bit higher, which allows my rear hatch to open freely. I only mention this so that you can check your clearance (if getting in and out of the back is important to you) before you scramble for factory attachments that you may not use anyway.