About This Who It Fits - Compatibility and Part Numbers: Made for Weber Spirit 300 Series and GS4 Spirit II 300 3-burner gas grills with front-mounted control panels; fits E310 E320 E330 S310 S320 S330 SP310 SP330, replacing 7638 grill grates and 7636 flavorizer bars. Measure First - Not for Side Control Models: This kit is not compatible with side-mounted control knob Spirit 300 grills or Spirit E310 2007 to 2012. Before ordering, confirm front-control layout and measure originals: grates about 17.5 x 11.9 in, bars 15.3 in long. What You Get - 7 Pack Core Refresh Kit: Includes 2 porcelain-enameled cast iron cooking grates and 5 porcelain-enameled steel flavorizer bars for compatible 3-burner grills, replacing the cooking surface, heat tent set, and burner protection area in one order. Texture and Cooking Experience: Cast iron provides solid heat retention for searing and clear grill marks; porcelain enamel creates a smoother cooking surface that helps reduce sticking, while 16-gauge steel bars help spread heat and shield burners from grease drips. When to Replace - Easy Drop-In Install: Use when old grates are rusty, peeling, warped, or causing uneven heat, flare-ups, weak sear marks, or burner exposure. Let the grill cool, remove worn parts, place the 5 bars, then set the 2 grates on top.