I have read through a long line of posts and still have yet to see the answer to this question. The above mentioned fireplace. I need the inserts or fo-brick liners for the inside of the fireplace. I keep getting a company that pulls up majestic series fireplaces. Will these inserts fit the marco fireplaces 792778d 46x16 it's a good fireplace and upon have a sweeper come out found two cracks in brick bottom and back I need to replace them any suggestions would be appreciated?