Weber #99242 3 Pack of Control Knobs for 3 Burner Spirit Grills Made in 2007 Weber # 99242 Set of 3 Control Knobs for 3 Burner Spirit 2007 grills. Light gray. Stem measures 1-3/8" long. Knob measures 2-1/4" in diameter Fits the following models- 3711001 Spirit E-210 Gas Grill, 3720301 Spirit SP-310 Gas Grill, 3721001 Spirit E-310 Gas Grill, 3731001 (2008) Spirit E-320 Gas Grill, 3811001 Spirit E-210 Gas Grill, 3820301 Spirit E-310 Gas Grill, 3821001 Spirit E-310 Gas Grill, 3831001 (2008) Spirit E-320 Gas Grill, E210 (LP) Spirit Gas Grill, 3811001 (2007)(NG) Spirit E-210 Grill Please visit Weber's website to ensure you order the correct parts for your specific grill. It is best to look up by serial #. The following link will also help you find the alpha numeric number. http://help.weber.com/schematics/#serial-number