Hargrove 28 Inch Replacement Fireplace Refractory Panel - Single Pack

We do not have the factory original panels for this model, so we would recommend the two-pack of these Hargrove panels, which you can see here.  That kit includes two 40" wide by 24" high panels that are about one inch thick and can be cut to the sizes you need.

The Hargrove 28 Inch Replacement Fireplace Refractory Panel - Single Pack measures 28 inches wide by 24 inches high by 1 inch thick. Since your back panel is 29 inches wide, a single 28-inch panel would be about 1 inch short and would not cover the full width of your back wall. The 1-inch thickness and wood-burning rating are compatible with your fireplace, but the width is the issue. Please note that this panel is custom made and non-returnable.

A single panel large enough to cut down to 24 x 29 inches is the MC Refractory 24 x 33 Large Brick Refractory Fireplace Panel. It measures 24 inches high by 33 inches wide by 1 inch thick, can be cut to fit, meets UL127 standards, and is designed for prefabricated zero-clearance fireplaces. It is currently $573.95.

If your original panel was about 1" thick, yes, this can be cut to fit and work as a rear panel.  

The molded bricks on the Hargrove 28-inch panel are laid in traditional stacked courses, and each brick measures approximately 8 inches long by 3 inches tall. The panel itself is 28 inches wide by 24 inches high, with the courses running horizontally across the 28-inch width. This means it will not be an exact match for the 4x8 inch pattern in your older Majestic fireplace; the brick length is very close, but the courses are shorter than 4 inches. Once a panel has seen a few fires and darkened, most customers find the difference in course height hard to notice, but we want you to be aware that the two patterns are not identical. This Hargrove replacement panel is designed as a universal, cut-to-fit stock rather than pre-shaped pieces for specific positions. The same panel material serves every location, and you trim it to fit your firebox with a masonry blade or a tile saw. Therefore, you simply order enough panel to cover the positions you are replacing. If you prefer a panel that precisely matches your existing brick pattern, we can check for a factory Majestic replacement panel through our distributor network. Please reply with the full model number from the data plate inside your firebox—it is usually on an inner side wall or behind the lower louver at the base of the opening, and our guide to finding your model and serial number shows where to look—along with your shipping zip code. We will then check availability and pricing for you.