I have a 125 WESO and saw that someone else had the two rear panels of their firebox coal liners go bad. I had the same problem last year and I cast two new and thicker panels using Rutland Castable refractory cement. I measured the space and the original parts. The panels must fit the width available and thickness is only an issue by the two removable end blocks used for coal and a few small tabs that hold the panels in place. My original cast-iron parts warped in the center where they overlap. I made the new panels thicker and made the overlap thicker on the the panel that sits on the front of the overlap. I used the new parts last winter and have recently started using the stove again this year. I also used the same cement to cast panels that sit on the face of the two end blocks. This made the firebox walls vertical on the ends, which protects the end blocks but also seem to make the coal burn better on the left and right ends. I used very simple homemade wooden forms/molds which were coated with vaseline for a release agent. Why junk a stove when you can make parts for under $30. I also cast a spare set of rear panels in case I need them in the future.