Throttle Control Knob / Troy-Bilt 731-0108Pack Size:1Ariens 07501900, MTD 731-0108, Troy-Bilt 1719268, Troy-Bilt 731-0108ESF 180-140, Foley/Belsaw 5979891, Foley/PLP 180-140, NHC 278-0233, Prime Line 7-03998, Sunbelt AC-21, Sunbelt B1AC21Ariens Most control heads; Troy Bilt Most control heads "T" style plastic knob, 3/4" W x 1 1/2" L