There are no bolts that comes with the Whispbar. They do extend out to fit your roof rails. At first you might not know they extend and think they are too short to fit.
The xadapt8
http://www.thule.com/en-US/US/Products/Base-Racks/LoadAccessories/Xadapt8
I have the BMW(Thule) race bike carriers. BMW uses a wider T-Bar track than the Yakima. So the xadapt8 comes with 3 smaller square that fits the narrower Yakima T-Bar channels. 2 long bolts and 1 short bolt. This is if you have the BMW race carriers. But they are designed to fit most T-Bar accessories.
The Thule version of the BMW Race Bike carriers has a clamp instead. That's the only difference. Built the same way.
REI has a 20% off right now so take advantage of it if you can.
They are very low profile and looks very good and is very quiet as well.
If you want some pictures let me know.
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