Can I mount a roof box on non-Thule roof bars? If yes, what adapters

Fits Thule rack systems, round bars, and most factory racks The rails also feature a convenient side channel for mounting Yakima® T-slot attachments

Click for more info and reviews of this Thule Roof Rack: Accessories

thule slot I'm trying to install a Thule TopRide Bike Carrier on the BMW OEM roof rack and it looks like the T-track adapters don't quite fit into the

thule t slot bolts These fit in the T slot but there is not much tension to keep them from sliding so they are not a stand alone solution jerdog53