Fits both although to be honest it would fit the square and wing shape better than the round. We switch back and forth between our round yakima cross bars and the square cross bars on our Honda Odyssey. On the yakima cross bars they have a tendency to "spin" right or left and not stay upright when sliding a boat on. On our flat/square cross bars we don't have this problem. Not sure how they'd fit on Thule because I don't own that system.