A motor vehicle car body framing apparatus for use at a welding station, the apparatus including a gate having a frame structure and a plurality of tooling members carried by the frame structure for use in positioning components of the vehicle body at the welding station for welding. The tooling members are mounted on the frame structure by a plurality of mounting brackets. Each mounting bracket includes a base member mounted on the frame structure and a riser mounted on the base and mounting a respective tooling member. The riser is fixedly mounted on the base by a single central fastener bolt which may include a reduced diameter portion sized to break away in response to predetermined impact against the riser. Each mounting bracket further includes means defining a triangulated mounting interface between the base and the riser arranged in concentric relation to the fastener bolt. The triangulated mounting interface may comprise a raised ring surface on one of the base and the riser centered on the axis of the fastener bolt and positioned at the mounting interface of the base and the riser. Each mounting bracket further includes two dowels received in aligned apertures in the base and in the riser at locations flanking the axis of the fastener bolt.