The Graphite 5 (GR905)902 (HF5902) Left Hand Side Brick is a genuine Hi-Flame spare part for the Graphite 5902. Fitted to the sides of the firebox, these bricks shield the steel walls from direct contact with the fire and reflect radiant heat efficiently. They are a wear item and should be replaced when cracked or crumbled. This replacement set fits the original positions correctly.