I grew up with wood heat in a free standing stove and my home now has electric heat. I have a fire place so I bought an insert from a buddy and when he sent me the measurements he sent H & W & D and it fit on paper ... It never dawned on me that the masonry work in the inside of the fire place goes back at an angle. So after getting it into place there is a gap of approx. 3in between the brick and the shield that goes around the stove that should sit against the brick... Is there a spacer or something that would solve this problem? I obviously can not make changes to the fire place it's self or the insert so what are my options if any? Thanks in advance..