These are supplied by one Vision imaging and are available in Landscape and Portrait https://www.onevisionimaging.com/shadow-box
14 x 12 shadow box frame (10x8 print)
16x12 shadow box frame (12x8 print)
16x13 shadow box frame (12x9 print)
18x15 shadow box frame (14x11 print)
19x14 shadow box frame (15x10 print)
20x16 shadow box frame (16x12 print)
22x16 shadow box frame (18x12 print)
24x20 shadow box frame (20x16 print)
28x20 shadow box frame (24x26 print)
28x24 shadow box frame (24x20 print)
36x26 shadow box frame (30x20 print)
42x30 shadow box frame (36x24 print)
48x38 shadow box frame (40x30 print)
12x12 shadow box frame (8x8 print)
14x14 shadow box frame (10x10 print)
16x16 shadow box frame (12x12 print)
20x20 shadow box frame (16x16 print)
24x24 shadow box frame (20x20 print)