The screws that attach the airbag to the brackets are made of steel, while the threaded part of the airbag is made of brass. Torque to 20 ft/lbs as instructed until lock washers are not even flattened. One of them broke before I reached 20 ft/lbs. Threading from steel to brass doesn't seem like the best idea to me, especially as the bag sits tight on the brackets and getting the screws straight was an issue.