Genuine Gibson PRPR-015 cream 1/8" neck pickup mounting ring and PRPR-025 cream 3/8" bridge pickup mounting ring. Made for Flat or Arch top guitars. Includes mounting screws. Per Gibson Guitar: The radius on the arch top guitar is so slight that the flat bottom ring is used for both tops. The mounting ring bends slightly and safely to accommodate the arch. Gibson does not sell a an arch top specific ring.