When removing my old converter the board was screwed to the metal box. Once the wires were disconnected and the screws removed the converter comes out leaving the 12v fuse panel. Yours may be riveted but should still be separate from the DC distribution panel.
I just replaced my converter with a Progressive Dynamics 9260. After pulling the old converter I discovered a brace along the outside wall that prevented mounting the new one in that spot. I ended up turning my entire box, AC breakers and all, upside down and doing some metal clearance to mount the new converter on a higher plane than the brace. I did remove the 12v panel and install it back in a upright position. I couldn't read the circuit identifiers standing on my head.
It works great, love the PD9260, but the AC electrons keep falling on the floor and rolling around. I know it's the AC electrons because they keep rolling back and forth instead of in a straight line.