i have a very old rayburn solid fuel cooker which i required but missing the fire bricks i have required these from a local store can you tell me which side these fit into the burner i think lefthand side and front there is also a small opening at there rear in the burner should this be bricked in as well the stove is a double oven and two hot plates on top and is the non enemal type the stove has being restored but never put back into use the rayburn is a heat master kind regards jackie