Spacer Tray 12/Pk Perforated Upper Right/Lower Left #31D by GC America SKU 970-1741AA 123 $11.99 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Sold out #31D Green Perforated Lower Left/Upper Right quadrant Plastic Impression Tray, Zig-Zag Design, Package of 12 Trays.