An anchor fixture, for attaching accessories to a vehicle surface has a fixture body with a base for attaching to the vehicle surface. The fixture body has an anchor aperture for receiving an anchor of a first accessory, a fastener aperture for receiving a tongue fastener of a second accessory, and an anchor chamber disposed at least partly outwardly of the anchor aperture and communicating with the anchor aperture and the fastener aperture. The fastener aperture central axis is parallel or at an acute angle to the base. Accessories and accessory attachment systems are presented. Another fixture has a slot defined by the fixture body for receiving a vehicle accessory projection and a surface opposite the slot for engaging the projection. The slot is adapted to receive an anchor which selectively engages a surface adjacent to the slot. Accessories with anchors and corresponding projections are also presented.