6x8 Opening for 8x10 Frame 4-ply Mat | Cheap Pete's
Amazon.com - Mat Board Center, 8x10 Aluminum Picture Frame - Displays 5x7 with Mat and 8x10 Without Mat - Horizontal and Vertical for Tabletop Wall Mounting Metal Photo Frame (Gold, 2-Pack)
Amazon.com - Icona Bay 8x10 Picture Frames Matted for 5x7 Photos (Black, 4 Pack), Sturdy Wood Composite Frames (not PS Plastic), Modern Style Frames, Liberty Collection
8x10 Grey Wood Frame Matted to 5x7 | Rustic Red Door
8x10 Grey Distressed Wood Frame White Mat | Rustic Red Door
14.4" X 18.4" Matted To 8" X 10" Thin Gallery Frame Black - Project 62™ : Target