Outwater Plastics 341-Cl Clear 3/4'' Rigid Vinyl Clear Plastic U-Channel/C- Channel 36 Inch Lengths (Pack of 4) - - Amazon.com
8-ft Radius Back U-channel for 3/8" Glass – LinkWood Marketing Group Inc.
Outwater Outwater Black Finish 3/4 Inch Inside Dimension Aluminum U-Channel 46 Inch Length (Pack of 3) Alu447-Bk C-Channel in the Furniture Moulding department at Lowes.com