Maybe (and maybe not)
this would be a direct replacement. If not, I'd just look for an appropriate DC fuse panel according to the number of fuses etc. that you have. There are quite a few possibilities out there.
Be aware that at least some of the Magnetek converters of that era have two DC output busses on the fuse panel: one is "filtered" and always connected to the battery, the other is "unfiltered" and connected to either the battery or the converter output depending on whether you're on shore power or not. The converter in such cases also has two separate outputs, one for charging the battery (usually some rudimentary regulation) and one, higher-current one for 12V lights etc. In those cases, the replacement fuse panel(s) need to be similarly split. The one linked above is arranged for the split output.