Q'Straint MA-410 M Series Occupant Securement Shoulder Belt, Gray, A-Track. The MA-410 incudes an A-Track fitting that attaches to the A-Track Anchorage on the vehicle wall. Q’Straint provides customers with a wide assortment of occupant restraint options that allow our customers to select the best choice for the passenger and vehicle layout. A Lap and Shoulder Belt are vital in ensuring the safety of your passenger; securing the wheelchair alone will not guarantee the safety of your passenger.