PolarPro Brass Step-Up Ring (62-67mm) 62-67-SUR B&H Photo Video
H&Y Revoring review / The End of Step-Up Rings? - Todd Dominey
Amazon.com : 67 to 82mm Metal Ring/67mm to 82mm Step Up Ring Filter Adapter for UV,ND,CPL,Metal Step Up Ring,Compatible with All 67mm Camera Lenses & 82mm Accessories : Electronics
Amazon.com : Freewell Step Up Filter Adapter Ring 49mm-67mm (Works with Freewell Magnetic Quick Swap as Well as Your Threaded Filter) : Electronics
PolarPro Brass step-Up Ring 62mm - 77mm | eBay
Polar Pro Brass Step-Up Ring for 77mm Lens to 95mm Filter 77-95-SUR