For that brand new masonry door, you'll need a fireplace door mounting kit to ensure a stable installation! We have a variety of options available to suit the specific door size that you've selected. We even have adjustable lintel clamp extension brackets that can be used for wider lintel irons! Each of our kits comes with the appropriate fireplace glass door hardware that will allow for a smooth, fast installation! For more details, please give us a call at 1-877-373-6677!