The Wedge 1985-1990 Oldsmobile Calais seat bracket is a direct bolt-in to all 1985-1990 Oldsmobile Calais'. It was designed specifically from the stock bracket and floor board. As with all Wedge seat brackets, if for any reason this bracket is not a perfect fit, please let us know and we'll make it right. Please note your ride height is more influenced by the thickness of the seat cushion not the height of the bracket. In most cases we design the bracket to ride at the optimal height based on the thickness of the stock seat cushion.