Technic Panel Curved 5 x 13 x 3 Tapered, Left #54

Reference

4443

Technic Panel Curved 5 x 13 x 3 Tapered, Left #54 (part 4443) is a LEGO element. CollectORbuild's catalog records it in 2 sets, including Koenigsegg Sadair's Spear Megacar and McLaren P1. It has been produced in 2 different colors.