Amazon: 7 inch backing pad
Angle Grinder Ribbed Backing Pad for Resin Fiber Disc with 5/8 inch11 Locking Nut (7 Inch) by Black Hawk. Astro 4607 5" PU Velcro Backing Pad. by Astro Pneumatic Tool. 4.3 out of 5 stars 456. SPTA 5Pcs 7"/180mm Compound Buffing Sponge Pads Polishing Pads Kit Buffing Pad For Car Buffer Polisher Sanding,Polishing, Waxing.