Wedge Plate 8 x 8 with 3 x 4 Cutout

Reference

6104

Wedge Plate 8 x 8 with 3 x 4 Cutout (part 6104) is a LEGO element. CollectORbuild's catalog records it in 25 sets, including Black Seas Barracuda and Celestial Sled. It has been produced in 7 different colors.