This is for a new 1961 Chevrolet Bel Air, Biscayne and Impala rear bumper mounting kit. The kit fits all body styles of the 1961 Chevy passenger car. This brand kit is the only one on the market that comes with the special hex shaped washers. The kit bolts all the brackets and braces together, then mounts those brackets to the rear bumper and all the bumper brackets to the frame. Sku# 3914