I would recommend a replacement for that assembly and take the old one to a scrap yard.
If you start looking at converters (Check out Progressive Dynamics site) you will find some where the 120 volt distribution panel, 12 volt panel and converter are all one assembly.. Well the PDI products are top of the line
But the older ones that used glass cartridge (AG3 mostly) fuses,, Well they are the BOTTOM of the line.. So since you are doing the full upgrade, spend the money on upgrading your converter. the upgrade will pay for itself after a year or two when you do NOT need to replace boiled dry batteries.
https://www.progressivedyn.com/rv/power-centers/And pick one
