First thing is to determine what you have. Winnebago used Progressive Dynamics for many years for both the Power Center and Converter. I list most of the information here Daves Place - RV Electrical Systems
. Once you know what you have, then you can determine what your replacement needs are. I recently replaced my power panel with a newer version from a wrecked trailer and the converter with a PD9260. You have to clearly understand what your going from / to when doing this.
Old Power Center / Converter
New Power Center and Converter