I have been trying to find a 7x7 chimney cap that fits inside my masonry liner. The liner is flush with the top of the chimney. All the caps I'm seeing are for clamping on the outside however I did find 1 that can be anchored down but would like to avoid that if possible. My original cap lasted 28 years which I bought when I built the house and dont remember it being an issue at the time. I bought it here locally in a small supply house and it fit perfectly and served me well. Cant seem to find what I'm looking for searching the net. Any help would be greatly appreciated. Thanks.