I picked up a second Thule Sidearm so I have no use for this now. It is a VW/Trek rack, but it is very similiar to a Thule 599xtr Big Mouth ($180+tax at rackology ). Attaches to VW OE racks using the slot in the top rail. Should fit other racks with the same slot. Comes with two matching lock cylinders (gives you one extra) and one key.