Hey, guys new to wood stoves here.... don't shoot me! I recently purchased a used Englander TR-18 (I think) and I just have a few questions. There was a 6'' stove pipe collar that came with it and it appears to have a channel in it for a gasket, but its thinner than the door gasket. Is there a specific one I need? Kit available? It looks to be about a 1/4'' inch thick. There are also a few firebricks that are cracked... is it pertinent I replace those before lighting in this fall? Any help would be great I'm new to all this. Thank you so much and if this has been asked before please just point me in the right direction. The stove is not how its going to be after i finish the walls and hearth just FYI