Upgraded Version - 2 Sets 4" Diameter Light Fixture Mounting Bracket, Helunsi Universal Crossbar for Lighting, Ceiling Fan Light Fixture Mounting Plate, Steel Circle Crossbar with Complete Accessories - Yahoo Shopping
RTNLIT 4 Inches Light Fixture Mounting Bracket, Universal Light Circle Crossbar Plate with Ground Screw and Acorn Cap Nuts for Mount Wall Light, Close to Ceiling Light, Chandelier(Pack of 2) - Amazon.com
SATCO 90-1650 Universal light mounting fixture bracket, 4inches diameter mounting plate with ground.Used for ceiling or wall lighting application and attaching the lamp canopies. (sold in lot of 12) - Lighting Images Technology
Upgraded Version - 2 Sets 4" Diameter Light Fixture Mounting Bracket, Helunsi Universal Crossbar for Lighting, Ceiling Fan Light Fixture Mounting Plate, Steel Circle Crossbar with Complete Accessories - Amazon.com
Mounting Light Fixtures - Fine Homebuilding
PEESIN 2 Pack Ceiling Light Fixture Mounting Bracket, 4 Inches Diameter Universal Light Crossbar, Steel Crossbar Plate with Ground Screw for Mount Wall Light, Close to Ceiling Light, Chandelier - Amazon.com