You don't indicate what's wrong with your current converter but: I replaced the converter section on the Magnatek converter that was on my 97 PW. I chose the size that was nearest to the old one (35 Amp) and therefore felt that no wiring considerations were necessary. The conversion is made by Progressive Dynamics.
https://www.progressivedyn.com/pd4600-converter/
I would suggest calling them to decide if you need/want a larger amp converter and what your options might be. Note that this replaces only the converter section of the old unit. The distribution panel (containing breakers/fuses and the wiring sent to different circuits) remains intact. I found it relatively easy to do the replacement.