Hello, I’m new to the forum. I recently purchased a Lopi wood burning insert. Everything seems to be in good shape but I need some sort of boot that allows the damper to operate but “seals” the liner to the insert. Can anyone point me in the right direction? By my own research I think my Lopi is an ‘80s model that is discontinued but a local fireplace store said I my be able to find parts or at least a design so I can fab up my own boot. Attached are pictures.