These are factory correct body mount bolts and washers for all A-body cars. This kit includes black zinc flange bolts and silver zinc washers. These are the correct exact to NOS bolts that were used on your car from the factory. They are the correct size, shape and color for a concourse restoration. They have a head marking with 3 dashes and the Circle in the center. This is a correct GM head marking. Beware of other guys selling the bolts that do not have the flange or a hardware bolt with the wrong head. This is the factory correct hardware.