No - it's merely the side of what forms the battery box. If you are standing next to the passenger front door, this panel would be the outside of the box closest to you. It's about 11 inches long from the back to a slight bend and then 11 inches to where it rivets to the front of the seat base next to the slave receptacle location.
The panel is about 10 inches tall.
45 MB,64 M151 Searchlight,66 M151A1,74 M151A2 Tow, 86 M1035