First, there's no need or advantage to looking for a replacement specific to your year/model. A modern converter/charger is going to be a multi-stage, "smart" charger which will be much kinder on your batteries.
Here's a good, common brand of converter (also available on Amazon). I replaced the converter in my 2002 Suncruiser with the 45 amp model:
https://powermaxconverters.com/product/pm3-12v-series/
The advice about matching the output (in amperage) is a good one but it's really about the wire gauge between the converter and the batteries. If not physically too big, a higher output converter will charge your batteries more quickly but may require larger gauge wires between the converter and the batteries. Assuming accessibility is reasonable, running new wiring isn't difficult. In any case, you won't need to change the 120V wiring, it will be just fine.
If the wires to your batteries are smaller than 10g, you should consider replacement in any case. Note that the smaller the number, the larger the wire, 8g is larger than 10g, etc.
When you remove the wires from your existing converter, make sure you clearly ID and label each one
as you remove it, double checking the polarity of the DC wires to the batteries with a multimeter. Don't rely on what you think the color coding might be when reconnecting. Not only do colors fade and change with age, Winnebago didn't always follow the red = Pos, black = Neg convention. Because of this, and my failure to double check, I blew an internal fuse in my new converter along with one in my furnace thermostat. Fortunately no other damage was done.
Here's a link that may help you with all this (even though it's from 2008, the principles are still applicable):
RV Factory Converter Upgrade | ModMyRV
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