My battery box is inside the car, like behind the headlight you show in your photograph. But it's a nice looking headlight! I have made a battery tray from polypropelene which fits snug and has a lip, so that, if my battery spills, it does not get the body. I'll sell you one for $25
1969 280SL,Signal Red, A/T, P/S, A/C, Both tops. Ret. engr. 1967 230SL - Sold